149
Step Command Remarks
3. Specify the routing domain
authentication mode and
password.
domain-authentication-mode
{
gca
key-id
{
hmac-sha-1
|
hmac-sha-224
|
hmac-sha-256
|
hmac-sha-384
|
hmac-sha-512
}
|
md5
|
simple
} {
cipher
cipher-string |
plain
plain-string }
[
ip
|
osi
]
By default, no routing domain
authentication is configured.
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 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.
IMPORTANT:
IS-IS GR and IS-IS NSR are mutually exclusive. Do not configure them at the same time.
To configure GR on the GR restarter:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enable IS-IS and
enter IS-IS view.
isis
[ process-id ] [
vpn-instance
vpn-instance-name ]
N/A
3. Enable IS-IS GR.
graceful-restart
By default, the GR capability for IS-IS is
disabled.
4. (Optional.) Suppress
the SA bit during
restart.
graceful-restart suppress-sa
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.
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