Huawei quidway s7700 - Configuring MPLS GR on the Backbone Network

By default, the interval for reestablishing the IS-IS GR session is 300 seconds.
5. (Optional) Run:
graceful-restart suppress-sa
The GR Restarter is configured to suppress the advertisement of the adjacency
relationship when it is restarting.
The suppress advertisement (SA) bit is used in the Hello PDUs by a restarting
switch to request its neighbors to suppress advertising the adjacency to the restarting
switch. The SA bit is removed once its database synchronization is over. Enabling this
feature avoids the black hole effect caused by sending and receiving LSP during the
restart process.
If the administrator does not want the restarting switch to set the SA bit in its Hello
PDUs, the administrator can use the undo graceful-restart suppress-sa command to
disable it.
By default, the SA bit does not take effect.
l Configure OSPF GR on the backbone network.
If OSPF is running on the public network, do as follows on the related PEs and Ps on the
backbone network:
1. Run:
system-view
The system view is displayed.
2. Run:
ospf process-id
The OSPF view is displayed.
3. Run:
opaque-capability enable
The opaque-lsa capability is enabled.
4. Perform the following as needed:
– To enable the GR capability of OSPF, run:
graceful-restart
– To enable the GR Help capability of OSPF at which the Restarter performs the
GR, run:
graceful-restart helper-role { { { ip-prefix ip-prefix-name | acl-
number acl-number | acl-name acl-name } | ignore-external-lsa | planned-
only } * | never }
It is suggested to enable the GR capability of OSPF on all the related PEs and Ps on
the backbone network.
By default, the GR capability of OSPF and the GR Help capability of OSPF are
disabled.
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3.13.3 Configuring MPLS GR on the Backbone Network
In the process of master/slave control board switchover or the system upgrade, you can configure
MPLS GR to ensure normal MPLS traffic forwarding. If LDP LSPs are configured on the
Quidway S7700 Smart Routing Switch
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
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