Contents

Managing sessions· 1

About session management 1

Session management operation· 1

Session types· 1

Session management functions· 2

Restrictions and guidelines: Session management configuration· 2

Session management tasks at a glance· 3

Setting the session aging time for different protocol states· 3

Setting the session aging time for different application layer protocols or applications· 4

Specifying persistent sessions· 5

Specifying the mode for session state machine· 5

Enabling session synchronization· 6

Configuring session logging· 8

Enabling session statistics collection for software fast forwarding· 9

Configuring alarms for abrupt session changes· 9

Configuring alarms for abrupt session table usage changes· 9

Configuring alarms for abrupt session creation rate changes· 10

Configuring alarms for abrupt session attempt rate changes· 11

Enabling ALG to process IP fragments and TCP segments· 11

Display and maintenance commands for session management 12

 

Managing sessions

About session management

Session management is a common module, providing basic services for NAT, ASPF, and attack detection and protection to implement their session-based services.

Session management defines packet exchanges at transport layer as sessions. It updates session states and ages out sessions according to data flows from the initiators or responders. Session management allows multiple features to process the same service packet.

Session management operation

Session management tracks the session status by inspecting the transport layer protocol information. It performs unified status maintenance and management of all connections based on session tables and relation tables.

When a connection request passes through the device from a client to a server, the device creates a session entry. The entry can contain the request and response information, such as:

·     Source IP address and port number.

·     Destination IP address and port number.

·     Transport layer protocol.

·     Application layer protocol.

·     Protocol state of the session.

A multichannel protocol requires that the client and the server negotiate a new connection based on an existing connection to implement an application. Session management enables the device to create a relation entry for each connection during the negotiation phase. The entry is used to associate the connection with the application. Relation entries will be removed after the associated connections are established.

If the destination IP address of a packet is a multicast IP address, the packet will be forwarded out of multiple ports. When a multicast connection request is received on an inbound interface, the device performs the following operations:

·     Creates a multicast session entry on the inbound interface.

·     Creates a corresponding multicast session entry for each outbound interface.

Unless otherwise stated, "session entry" in this chapter refers to both unicast and multicast session entries.

Session types

When receiving the first packet of a data flow, the device processes the packet and creates a session entry based on the processing result. For subsequent packets of the data flow, the device performs fast forwarding based on the session entry. For more information about fast forwarding, see Layer 3—IP Services Configuration Guide.

Sessions are classified into the following types according to the action taken on the packets that match a session entry:

·     Permit session—The device permits all packets of a permit session. The device generates a permit session entry for a data flow if it permits the first packet of the data flow.

A permit session can only track connection status. It cannot deny potential attack packets. To deny specific packets, you must use permit sessions together with security features.

·     Deny session—The device drops all packets of a deny session. The device generates a deny session entry for a data flow if it drops the first packet of the data flow.

Unless otherwise stated, the sessions in this document refer to permit sessions.

Figure 1 shows the workflow of session-based traffic forwarding.

Figure 1 Session-based traffic forwarding

 

Session management functions

Session management enables the device to provide the following functions:

·     Creates sessions for protocol packets, updates session states, and sets aging time for sessions in different protocol states.

·     Supports port mapping for application layer protocols (see "Configuring APR"), enabling application layer protocols to use customized ports.

·     Sets aging time for sessions based on application layer protocols.

·     Supports ICMP/ICMPv6 error packet mapping, enabling the device to search for original sessions according to the payloads in the ICMP/ICMPv6 error packets.

Because error packets are generated due to host errors, the mapping can help speed up the aging of the original sessions.

·     Supports persistent sessions, which are kept alive for a long period of time.

·     Supports session management for the control channels and dynamic data channels of application layer protocols, for example, FTP.

Restrictions and guidelines: Session management configuration

For a TCP session in ESTABLISHED state, the priority order of the associated aging time is as follows:

·     Aging time for persistent sessions.

·     Aging time for sessions of application layer protocols.

·     Aging time for sessions in different protocol states.

If the device has excessive sessions, do not set the aging time shorter than the default for a certain protocol state or an application layer protocol. Short aging time settings can make the device slow in response.

Session management tasks at a glance

To configure session management, perform the following tasks:

·     Configure session management timers

¡     Setting the session aging time for different protocol states

¡     Setting the session aging time for different application layer protocols or applications

¡     Specifying persistent sessions

·     Specifying the mode for session state machine

·     Enabling session synchronization

·     Configuring session logging

·     Enabling session statistics collection for software fast forwarding

·     Configuring alarms for abrupt session changes

·     Enabling ALG to process IP fragments and TCP segments

Setting the session aging time for different protocol states

About this task

If a session in a certain protocol state has no packet hit before the aging time expires, the device automatically removes the session.

Procedure

1.     Enter system view.

system-view

2.     Set the session aging time for different protocol states.

session aging-time state { fin | icmp-reply | icmp-request | icmpv6-reply | icmpv6-request | rawip-open | rawip-ready | syn | tcp-close | tcp-est | tcp-time-wait | udp-open | udp-ready } time-value

The default aging time for sessions in different protocol states is as follows:

¡     FIN_WAIT: 30 seconds.

¡     ICMP-REPLY: 30 seconds.

¡     ICMP-REQUEST: 60 seconds.

¡     ICMPv6-REPLY: 30 seconds.

¡     ICMPv6-REQUEST: 60 seconds.

¡     RAWIP-OPEN: 30 seconds.

¡     RAWIP-READY: 60 seconds.

¡     TCP SYN-SENT and SYN-RCV: 30 seconds.

¡     TCP-CLOSE: 2 seconds.

¡     TCP ESTABLISHED: 3600 seconds.

¡     TCP-TIME-WAIT: 2 seconds.

¡     UDP-OPEN: 30 seconds.

¡     UDP-READY: 60 seconds.

Setting the session aging time for different application layer protocols or applications

About this task

The aging time for sessions of different application layer protocols or applications are valid for TCP sessions in ESTABLISHED state or UDP sessions in READY state. For sessions used by other application layer protocols, the aging time for sessions in different protocol states applies.

Supported application layer protocols or applications specified in this command depend on the APR module. For information about APR, see "Configuring APR."

Procedure

1.     Enter system view.

system-view

2.     Set the session aging time for different application layer protocols.

session aging-time application application-name time-value

By default, the aging time is 1200 seconds for sessions of application layer protocols or applications except for the following sessions:

¡     BOOTPC sessions: 120 seconds.

¡     BOOTPS sessions: 120 seconds.

¡     DNS sessions: 1 second.

¡     FTP sessions: 3600 seconds.

¡     FTP-DATA sessions: 240 seconds.

¡     GPRS-DATA sessions: 60 seconds.

¡     GPRS-SIG sessions: 60 seconds.

¡     GTP-CONTROL sessions: 60 seconds.

¡     GTP-USER sessions: 60 seconds.

¡     H.225 sessions: 3600 seconds.

¡     H.245 sessions: 3600 seconds.

¡     HTTPS sessions: 600 seconds.

¡     ILS sessions: 3600 seconds.

¡     L2TP sessions: 120 seconds.

¡     MGCP-CALLAGENT sessions: 60 seconds.

¡     MGCP-GATEWAY sessions: 60 seconds.

¡     NETBIOS-DGM sessions: 3600 seconds.

¡     NETBIOS-NS sessions: 3600 seconds.

¡     NETBIOS-SSN sessions: 3600 seconds.

¡     NTP sessions: 120 seconds.

¡     PPTP sessions: 3600 seconds.

¡     QQ sessions: 120 seconds.

¡     RAS sessions: 300 seconds.

¡     RIP sessions: 120 seconds.

¡     RSH sessions: 60 seconds.

¡     RTSP session: 3600 seconds.

¡     SCCP sessions: 3600 seconds.

¡     SIP sessions: 300 seconds.

¡     SNMP sessions: 120 seconds.

¡     SNMPTRAP sessions: 120 seconds.

¡     SQLNET sessions: 600 seconds.

¡     STUN sessions: 600 seconds.

¡     SYSLOG sessions: 120 seconds.

¡     TACACS-DS sessions: 120 seconds.

¡     TFTP sessions: 60 seconds.

¡     WHO sessions: 120 seconds.

¡     XDMCP sessions: 3600 seconds.

Specifying persistent sessions

About this task

This task is only for TCP sessions in ESTABLISHED state. You can specify TCP sessions that match the permit statements in the specified ACL as persistent sessions, and set longer lifetime or never-age-out persistent sessions.

A persistent session is not removed until one of the following events occurs:

·     The session entry ages out.

·     The device receives a connection close request from the initiator or responder.

·     You manually clear the session entries.

Procedure

1.     Enter system view.

system-view

2.     Specify persistent sessions.

session persistent acl [ ipv6 ] acl-number [ aging-time time-value ]

Specifying the mode for session state machine

About this task

When asymmetric-path traffic exists in a hot backup system operating in session active/standby mode, set the mode of session state machine to loose to avoid abnormal traffic loss.

When asymmetric-path traffic exists in a hot backup system operating in session dual-active mode, set the mode of session state machine to compact for disconnected sessions to age out timely.

As a best practice, change the mode of session state machine only when asymmetric-path traffic exists. This feature degrades performance of session-based security check. Make sure you are fully aware of its impact when you use it on a live network.

Procedure

1.     Enter system view.

system-view

2.     Specify the mode for session state machine.

session state-machine mode { compact | loose }

By default, session state machine is in strict mode.

Enabling session synchronization

Hardware and feature compatibility

Hardware	Feature compatibility
MSR810, MSR810-W, MSR810-W-DB, MSR810-LM, MSR810-W-LM, MSR810-10-PoE, MSR810-LM-HK, MSR810-W-LM-HK, MSR810-LM-CNDE-SJK, MSR810-CNDE-SJK	No
MSR810-LMS, MSR810-LUS	No
MSR810-LMS-EA, MSR810-LME	No
MSR1004S-5G	No
MSR2600-6-X1, MSR2600-10-X1, MSR2600-15-X1	No
MSR 2630	Yes
MSR3600-28, MSR3600-51	Yes
MSR3600-28-SI, MSR3600-51-SI	Yes
MSR3600-28-X1, MSR3600-28-X1-DP, MSR3600-51-X1, MSR3600-51-X1-DP	Yes
MSR3610-I-DP, MSR3610-IE-DP, MSR3610-IE-ES, MSR3610-IE-EAD, MSR-EAD-AK770, MSR3610-I-IG, MSR3610-IE-IG	No
MSR3610-X1, MSR3610-X1-DP, MSR3610-X1-DC, MSR3610-X1-DP-DC, MSR3620-X1, MSR3640-X1	Yes
MSR 3610, MSR 3620, MSR 3620-DP, MSR 3640, MSR 3660	Yes
MSR3610-G, MSR3620-G	Yes
MSR3640-X1-HI	Yes

‌

Hardware	Feature compatibility
MSR810-W-WiNet, MSR810-LM-WiNet	No
MSR830-4LM-WiNet	No
MSR830-5BEI-WiNet, MSR830-6EI-WiNet, MSR830-10BEI-WiNet	No
MSR830-6BHI-WiNet, MSR830-10BHI-WiNet	No
MSR2600-6-WiNet, MSR2600-10-X1-WiNet	No
MSR2630-WiNet	Yes
MSR3600-28-WiNet	Yes
MSR3610-X1-WiNet	Yes
MSR3610-WiNet, MSR3620-10-WiNet, MSR3620-DP-WiNet, MSR3620-WiNet, MSR3660-WiNet	Yes

‌

Hardware	Feature compatibility
MSR2630-XS	No
MSR3600-28-XS	Yes
MSR3610-XS	Yes
MSR3620-XS	Yes
MSR3610-I-XS	No
MSR3610-IE-XS	No
MSR3620-X1-XS	Yes
MSR3640-XS	Yes
MSR3660-XS	Yes

‌

Hardware	Feature compatibility
MSR810-LM-GL	No
MSR810-W-LM-GL	No
MSR830-6EI-GL	No
MSR830-10EI-GL	No
MSR830-6HI-GL	No
MSR830-10HI-GL	No
MSR1004S-5G-GL	No
MSR2600-6-X1-GL	No
MSR3600-28-SI-GL	Yes

‌

About this task

This feature enables devices to synchronize sessions and dynamic entries of session-based services. Typically, these devices back up each other and use a virtual IP address to communicate with a peer device. When the primary device fails, a backup device takes over to process and forward service traffic. The failover process is transparent to the peer device, and does not interrupt ongoing services.

This feature also provides automatic backup service for the device. The system automatically backs up session tables and relation tables that are generated by applications that use ALG. These applications include H.323, SIP, and ILS.

Enable session synchronization for DNS and HTTP in the following situations:

·     Users are aware that the current HTTP or DNS sessions will last for a long time.

·     HTTP or DNS session backup is required.

In a network that has asymmetric traffic, heavy service traffic might cause service delay or service unavailable because sessions cannot be backed up timely. For example, one device forwards the TCP SYN packets, and another device forwards its ACK packets. If the session tables of the two devices are not synchronized, the TCP packets will be dropped because of state error. To resolve this issue, enable session synchronization for asymmetric traffic.

Restrictions and guidelines

On an IRF fabric, the NAT configuration is dependent of session synchronization. If session synchronization is enabled, make sure NAT is configured on global interfaces such as aggregate interfaces and redundant interfaces. If you configure NAT on physical ports, disable session synchronization as a best practice.

This feature cannot be used together with the hot-backup enable command. For information about RBM, see High Availability Command Reference.

Procedure

1.     Enter system view.

system-view

2.     Enable session synchronization.

session synchronization enable [ asymmetric ]

By default, session synchronization is disabled.

After session synchronization is enabled, session synchronization is enabled for all application layer protocols except DNS and HTTP by default.

3.     (Optional.) Enable session synchronization for DNS, HTTP, or both.

session synchronization { dns | http } *

By default, session synchronization is disabled for DNS and HTTP.

Configuring session logging

About this task

Session logs provide information about user access, IP address translation, and network traffic for security auditing. These logs are sent to the log server or the information center.

The device supports time-based or traffic-based logging:

·     Time-based logging—The device outputs session logs regularly.

·     Traffic-based logging—The device outputs a session log when the traffic amount of a session reaches a threshold only when the session statistics collection for software fast forwarding feature is enabled. After outputting a session log, the device resets the traffic counter for the session. The traffic-based thresholds can be byte-based and packet-based. If you set both thresholds, the last configuration takes effect.

If you set both time-based and traffic-based logging, the device outputs a session log when whichever is reached. After outputting a session log, the device resets the traffic counter and restarts the interval for the session.

If you enable session logging but do not enable logging for session creation or deletion, the device does not output a session log when a session entry is created or removed.

Restrictions and guidelines

The session logging feature must work with the flow log or fast log output feature to generate session logs. Session logs can be output in flow log or fast log output format. By default, they are output in flow log format. For information about flow log and fast log output, see Network Management and Monitoring.

Procedure

1.     Enter system view.

system-view

2.     (Optional.) Set the threshold for time-based session logging.

session log time-active time-value

By default, no threshold is set for time-based session logging.

3.     (Optional.) Set a threshold for traffic-based logging.

session log { bytes-active bytes-value | packets-active packets-value }

By default, no threshold is set for traffic-based logging.

4.     (Optional.) Enable logging for session creation.

session log flow-begin

By default, logging for session creation is disabled.

5.     (Optional.) Enable logging for session deletion.

session log flow-end

By default, logging for session deletion is disabled.

6.     Enter interface view.

interface interface-type interface-number

7.     Enable session logging.

session log enable { ipv4 | ipv6 } [ acl acl-number ] { inbound | outbound }

By default, session logging is disabled.

Enabling session statistics collection for software fast forwarding

About this task

This feature enables the device to collect session-based outbound and inbound packets and bytes. You can display session statistics based on different criteria.

·     To display statistics per unicast session, use the display session table command.

·     To display statistics per unicast packet type, use the display session statistics command.

·     To display statistics per multicast session, use the display session table multicast command.

·     To display statistics per multicast packet type, use the display session statistics multicast command.

Procedure

1.     Enter system view.

system-view

2.     Enable session statistics collection for software fast forwarding.

session statistics enable

By default, session statistics collection is disabled for software fast forwarding.

Configuring alarms for abrupt session changes

Configuring alarms for abrupt session table usage changes

About this task

Perform this task for the device to generate alarms for abrupt increase or drop in the session table usage. With this feature enabled, the system collects the session table usage at an interval of 10 seconds and checks whether the following indicators reach the corresponding alarm thresholds:

·     Session table usage change in percentage—Obtained by dividing the difference between the session entry counts at the beginning and end of a collection interval by the session entry count at the beginning of the collection interval.

·     Base session table usage in percentage—Obtained by dividing the session entry count at the beginning of a collection interval by the supported maximum number of session entries.

If both of the following conditions are met in a detection interval, the system generates an alarm for the abrupt change of the session table usage:

·     The session table usage change threshold is reached.

·     The base session table usage threshold is crossed.

Procedure

1.     Enter system view.

system-view

2.     Enable alarms for abrupt session table usage changes.

session alarm usage-abrupt enable

By default, alarms are disabled for abrupt session table usage changes.

3.     Set the alarm thresholds for abrupt session table usage changes.

session alarm usage-abrupt threshold threshold-value [ base-threshold base-value ]

By default, the session table usage change threshold is 20%, and the base session table usage threshold is 10%.

Configuring alarms for abrupt session creation rate changes

About this task

Perform this task for the device to generate alarms for abrupt increase or drop in the session creation rate. With this feature enabled, the system collects the session creation rate at an interval of 10 seconds and checks whether the following indicators reach the corresponding alarm thresholds:

·     Session creation rate change in percentage—Obtained by dividing the difference between the session creation rates at the beginning and end of a collection interval by the session creation rate at the beginning of the collection interval.

·     Base session creation rate in percentage—Obtained by dividing the session creation rate at the beginning of a collection interval by 100000.

If both of the following conditions are met in a detection interval, the system generates an alarm for the abrupt change of the session creation rate:

·     The session creation rate change threshold is reached.

·     The base session creation rate threshold is crossed.

Procedure

1.     Enter system view.

system-view

2.     Enable alarms for abrupt session creation rate changes.

session alarm rate-abrupt enable

By default, alarms are disabled for abrupt session creation rate changes.

3.     Set the alarm thresholds for abrupt session creation rate changes.

session alarm rate-abrupt threshold threshold-value [ base-threshold base-value ]

By default, the session creation rate change threshold is 20%, and the base session creation rate threshold is 10%.

Configuring alarms for abrupt session attempt rate changes

About this task

Perform this task for the device to generate alarms for abrupt increase or drop in the session creation attempt rate. With this feature enabled, the system collects the session creation attempt rate at an interval of 10 seconds and checks whether the following indicators reach the corresponding alarm thresholds:

·     Session attempt rate change in percentage—Obtained by dividing the difference between the session creation attempt rates at the beginning and end of a collection interval by the session creation attempt rate at the beginning of the collection interval.

·     Base session attempt rate in percentage—Obtained by dividing the session creation attempt rate at the beginning of a collection interval by 100000.

If both of the following conditions are met in a detection interval, the system generates an alarm for the abrupt change of the session creation attempt rate:

·     The session attempt rate change threshold is reached.

·     The base session attempt rate threshold is crossed.

Procedure

1.     Enter system view.

system-view

2.     Enable alarms for abrupt session attempt rate changes.

session alarm try-rate-abrupt enable

By default, alarms are disabled for abrupt session attempt rate changes.

3.     Set the alarm thresholds for abrupt session attempt rate changes.

session alarm try-rate-abrupt threshold threshold-value [ base-threshold base-value ]

By default, the session attempt rate change threshold is 20%, and the base session attempt rate threshold is 10%.

Enabling ALG to process IP fragments and TCP segments

About this task

This task enables ALG to process IP fragments and TCP segments of specified protocols. In the current software version, ALG can process only IP fragments and TCP segments of SIP.

Procedure

1.     Enter system view.

system-view

2.     Enable ALG to process IP fragments and TCP segments.

session alg fragment sip

By default, ALG does not process IP fragments and TCP segments.

Display and maintenance commands for session management

 

Execute display commands in any view and reset commands in user view.

 

Task	Command
Display the aging time for sessions of different application layer protocols.	display session aging-time application
Display the aging time for sessions in different protocol states.	display session aging-time state
Display unicast deny session statistics.	In standalone mode: display session fast-drop statistics [ summary ] In IRF mode: display session fast-drop statistics [ summary ] [ slot slot-number ]
Display IPv4 unicast deny session entries.	In standalone mode: display session fast-drop table ipv4 [ verbose ] In IRF mode: display session fast-drop table ipv4 [ slot slot-number ] [ verbose ]
Display IPv6 unicast deny session entries.	In standalone mode: display session fast-drop table ipv6 [ verbose ] In IRF mode: display session fast-drop table ipv6 [ slot slot-number ] [ verbose ]
Display top deny session statistics.	display session fast-drop top-statistics { last-1-hour | last-24-hours | last-30-days }
Display relation table entries.	In standalone mode: display session relation-table { ipv4 | ipv6 } In IRF mode: display session relation-table { ipv4 | ipv6 } [ slot slot-number ]
Display unicast session statistics.	In standalone mode: display session statistics [ history-max | summary ] In IRF mode: display session statistics [ history-max | summary ] [ slot slot-number ]
Display IPv4 unicast session statistics.	In standalone mode: display session statistics ipv4 [ [ responder ] { application application-name | destination-ip destination-ip | destination-port destination-port | interface interface-type interface-number | protocol { dccp | dns | ftp | gtp | h323 | http | icmp | ils | mgcp | nbt | pptp | raw-ip | rsh | rtsp | sccp | sctp | sip | smtp | sqlnet | ssh | tcp | telnet | tftp | udp | udp-lite | xdmcp } | source-ip source-ip | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmp-reply | icmp-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] In IRF mode: display session statistics ipv4 [ [ responder ] { application application-name | destination-ip destination-ip | destination-port destination-port | interface interface-type interface-number | protocol { dccp | dns | ftp | gtp | h323 | http | icmp | ils | mgcp | nbt | pptp | raw-ip | rsh | rtsp | sccp | sctp | sip | smtp | sqlnet | ssh | tcp | telnet | tftp | udp | udp-lite | xdmcp } | source-ip source-ip | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmp-reply | icmp-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] [ slot slot-number ]
Display IPv6 unicast session statistics.	In standalone mode: display session statistics ipv6 [ [ responder ] { application application-name | destination-ip destination-ip | destination-port destination-port | interface interface-type interface-number | protocol { dccp | dns | ftp | gtp | h323 | http | icmpv6 | ils | mgcp | nbt | pptp | raw-ip | rsh | rtsp | sccp | sctp | sip | smtp | sqlnet | ssh | tcp | telnet | tftp | udp | udp-lite | xdmcp } | source-ip source-ip | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmpv6-reply | icmpv6-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] In IRF mode: display session statistics ipv6 [ [ responder ] { application application-name | destination-ip destination-ip | destination-port destination-port | interface interface-type interface-number | protocol { dccp | dns | ftp | gtp | h323 | http | icmpv6 | ils | mgcp | nbt | pptp | raw-ip | rsh | rtsp | sccp | sctp | sip | smtp | sqlnet | ssh | tcp | telnet | tftp | udp | udp-lite | xdmcp } | source-ip source-ip | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmpv6-reply | icmpv6-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] [ slot slot-number ]
Display multicast session statistics.	In standalone mode: display session statistics multicast In IRF mode: display session statistics multicast [ slot slot-number ]
Display IPv4 unicast session table entries.	In standalone mode: display session table ipv4 [ [ responder ] { application application-name | destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | interface interface-type interface-number | protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmp-reply | icmp-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] [ verbose ] In IRF mode: display session table ipv4 [ slot slot-number ] [ [ responder ] { application application-name | destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | interface interface-type interface-number | protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmp-reply | icmp-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] [ verbose ]
Display IPv6 unicast session table entries.	In standalone mode: display session table ipv6 [ [ responder ] { application application-name | destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | interface interface-type interface-number | protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmpv6-reply | icmpv6-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] [ verbose ] In IRF mode: display session table ipv6 [ slot slot-number ] [ [ responder ] { application application-name | destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | interface interface-type interface-number | protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port | state { dccp-closereq | dccp-closing | dccp-open | dccp-partopen | dccp-request | dccp-respond | dccp-timewait | icmpv6-reply | icmpv6-request | rawip-open | rawip-ready | sctp-closed | sctp-cookie-echoed | sctp-cookie-wait | sctp-established | sctp-shutdown-ack-sent | sctp-shutdown-recd | sctp-shutdown-sent | tcp-close | tcp-close-wait | tcp-est | tcp-fin-wait | tcp-last-ack | tcp-syn-recv | tcp-syn-sent | tcp-syn-sent2 | tcp-time-wait | udp-open | udp-ready | udplite-open | udplite-ready } | vpn-instance vpn-instance-name } * ] [ verbose ]
Display IPv4 multicast session table entries.	In standalone mode: display session table multicast ipv4 [ [ responder ] { destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port } * ] [ verbose ] In IRF mode: display session table multicast ipv4 [ slot slot-number ] [ [ responder ] { destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port } * ] [ verbose ]
Display IPv6 multicast session table entries.	In standalone mode: display session table multicast ipv6 [ [ responder ] { destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port } * ] [ verbose ] In IRF mode: display session table multicast ipv6 [ slot slot-number ] [ [ responder ] { destination-ip start-destination-ip [ end-destination-ip ] | destination-port destination-port | protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } | source-ip start-source-ip [ end-source-ip ] | source-port source-port } * ] [ verbose ]
Clear relation table entries.	In standalone mode: reset session relation-table [ ipv4 | ipv6 ] In IRF mode: reset session relation-table [ ipv4 | ipv6 ] [ slot slot-number ]
Clear unicast session statistics.	In standalone mode: reset session statistics In IRF mode: reset session statistics [ slot slot-number ]
Clear multicast session table entries.	In standalone mode: reset session statistics multicast In IRF mode: reset session statistics multicast [ slot slot-number ]
Clear IP unicast session table entries.	In standalone mode: reset session table In IRF mode: reset session table [ slot slot-number ]
Clear IPv4 unicast session table entries.	In standalone mode: reset session table ipv4 [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ] In IRF mode: reset session table ipv4 [ slot slot-number ] [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port  source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ]
Clear IPv6 unicast session table entries.	In standalone mode: reset session table ipv6 [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ] In IRF mode: reset session table ipv6 [ slot slot-number ] [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port  source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ]
Clear IP multicast session table entries.	In standalone mode: reset session table multicast In IRF mode: reset session table multicast [ slot slot-number ]
Clear IPv4 multicast session table entries.	In standalone mode: reset session table multicast ipv4 [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ] In IRF mode: reset session table multicast ipv4 [ slot slot-number ] [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmp | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port  source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ]
Clear IPv6 multicast session table entries.	In standalone mode: reset session table multicast ipv6 [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ] In IRF mode: reset session table multicast ipv6 [ slot slot-number ] [ source-ip source-ip ] [ destination-ip destination-ip ] [ protocol { dccp | icmpv6 | raw-ip | sctp | tcp | udp | udp-lite } ] [ source-port  source-port ] [ destination-port destination-port ] [ vpn-instance vpn-instance-name ]