Huawei quidway s7700 Configuration Manual page 172

Quidway S7700 Smart Routing Switch
Configuration Guide - VPN
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Issue 01 (2011-07-15)
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.
Configure GR of the OSPF multi-instance between PEs and CES.
Do as follows if OSPF is run between the PE and the CE:
1. Run:
system-view
The system view is displayed.
2. Run:
ospf process-id vpn-instance vpn-instance-name
The OSPF multi-instance 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 local link signaling capability, the out-of-band capability, the GR Help
capability and the GR capability of OSPF are all disabled.
Configure BGP GR between PEs and CEs.
Do as follows on the PE and CE if EBGP is run between them:
1. Run:
system-view
The system view is displayed.
2. Run:
bgp as-number
The BGP view is displayed.
3. Run:
graceful-restart
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3 BGP MPLS IP VPN Configuration
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