Configuring Graceful Restart - Cisco NCS 5500 Series Configuration Manual

Implementing RSVP for MPLS-TE
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Related Topics
• Configuring RSVP Message Authentication Globally, on page 28
• Configuring RSVP Authentication for an Interface, on page 29
• RSVP for MPLS-TE Features- Details, on page 34

Configuring Graceful Restart

RSVP graceful restart provides a mechanism to ensure high availability (HA), which allows detection and
recovery from failure conditions for systems running cisco IOS XR software and ensures non-stop forwarding
services. RSVP graceful restart is based on RSVP hello messages and allows RSVP TE enabled routers to
recover RSVP state information from neighbors after a failure in the network. RSVP uses a Restart Cap object
(RSVP RESTART) in hello messages in which restart and recovery times are specified to advertise the restart
capability of a node. The neighboring node helps a restarting node by sending a Recover Label object to
recover the forwarding state of the restarting node.
You can configure standard graceful restart which is based on node-id address based hello messages and also
interface-based graceful restart which is interface-address based hello messages.
Configuration Example
In this example, RSVP-TE is already enabled on the router nodes on a network and graceful restart needs to
be enabled on the router nodes for failure recovery. Graceful restart is configured globally to enabled node-id
address based hello messages and also on a router interface to support interface-address based hello messages.
RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# rsvp
RP/0/RP0/CPU0:router(config-rsvp)# signalling graceful-restart
RP/0/RP0/CPU0:router(config-rsvp)# interface HundredGigabitEthernet 0/0/0/3
RP/0/RP0/CPU0:router(config-rsvp-if)# signalling graceful-restart
interface-based
RP/0/RP0/CPU0:router(config)# commit
Verification
Use the following commands to verify that graceful restart is enabled.
RP/0/RP0/CPU0:router# show rsvp graceful-restart
Graceful restart: enabled Number of global neighbors: 1
Local MPLS router id: 192.168.55.55
Restart time: 60 seconds
Recovery timer: Not running
Hello interval: 5000 milliseconds Maximum Hello miss-count: 4
RP/0/RP0/CPU0:router# show rsvp graceful-restart neighbors detail
Neighbor: 192.168.77.77 Source: 192.168.55.55 (MPLS)
Hello instance for application MPLS
Hello State: UP
Number of times communications with neighbor lost: 0
Static Global KeyChain
mpls-keys
No error
1
HMAC MD5 (16)
33
Not supported
Recovery time: 120 seconds
(for 00:20:52)
MPLS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
Configuring RSVP for MPLS-TE
31