Configuring Is-Is Gr - HP 6125XLG Configuration Manual

Step
3. Specify the routing domain
authentication mode and
password.

Configuring IS-IS GR

GR ensures forwarding continuity when a routing protocol restarts or an active/standby switchover
occurs.
Two routers are required to complete a GR process. The following are router roles in a GR process.
GR Restarter—Graceful restarting router. It must have GR capability.
•
• GR Helper—A neighbor of the GR Restarter. It assists the GR Restarter to complete the GR process.
By default, the device acts as the GR Helper.
Configure IS-IS GR on the GR Restarter.
GR Restarter uses the following timers:
T1 timer—Specifies the times that GR Restarter can send a Restart TLV with the RR bit set. When
•
rebooted, the GR Restarter sends a Restart TLV with the RR bit set to its neighbor. If the GR Restarter
receives a Restart TLV with the RA set from its neighbor before the T1 timer expires, the GR process
starts. Otherwise, the GR process fails.
• T2 timer—Specifies the LSDB synchronization interval. Each LSDB has a T2 timer. The Level- 1 -2 router
has two T2 timers: a Level- 1 timer and a Level-2 timer. If the LSDBs have not synchronized before the
two timers expire, the GR process fails.
T3 timer—Specifies the GR interval. The GR interval is set as the holdtime in hello PDUs. Within the
•
interval, the neighbors maintain their adjacency with the GR Restarter. If the GR process has not
completed within the holdtime, the neighbors tear down the neighbor relationship and the GR
process fails.
To configure GR on the GR Restarter:
Step
1. Enter system view.
2. Enable IS-IS and
enter IS-IS view.
3. Enable IS-IS GR.
4. (Optional.) Suppress
the SA bit during
restart.
Command
domain-authentication-mode
{ md5 | simple | gca key-id
{ hmac-sha-1 | hmac-sha-224 |
hmac-sha-256 | hmac-sha-384 |
hmac-sha-512 } } { cipher
cipher-string | plain plain-string }
[ ip | osi ]
Command
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
graceful-restart
graceful-restart suppress-sa
132
Remarks
By default, no routing domain
authentication is configured.
Remarks
N/A
N/A
By default, the GR capability for IS-IS is
disabled.
By default, the SA bit is not suppressed.
By enabling the GR Restarter to suppress the
Suppress-Advertisement (SA) bit in the hello
PDUs, the neighbors will still advertise their
adjacency with the GR Restarter.