Configuring Bgp Gr - HPE FlexNetwork HSR6800 Configuration Manual

Step
Configure a confederation
3.
ID.
Specify peering sub ASs in
4.
the confederation.
Configuring confederation compatibility
If some other routers in the confederation do not comply with RFC 3065, you must enable
confederation compatibility to allow the router to work with those routers.
To configure confederation compatibility:
Step
Enter system view.
1.
Enter BGP view.
2.
Enable compatibility with
3.
routers not compliant with
RFC 3065 in the
confederation.

Configuring BGP GR

Graceful Restart (GR) ensures the continuity of packet forwarding when an active/standby
switchover occurs:
•
GR restarter—Graceful restarting router. It must be GR capable.
•
GR helper—A neighbor of the GR restarter. It helps the GR restarter to complete the GR
process.
NOTE:
• Unless otherwise specified, an active/standby switchover collectively refers to an active/standby
MPU switchover in standalone mode and a global active/standby MPU switchover in IRF mode.
• A device can act as a GR restarter and GR helper at the same time.
Following is a GR process:
A BGP GR restarter and helper exchange Open messages with GR capability. If both parties
1.
have the GR capability, the session established between them is GR capable.
When an active/standby switchover occurs on the GR restarter, the GR restarter does not
2.
remove existing route entries. The GR restarter still uses these routes for packet forwarding.
The GR helper does not delete the routes learned from the GR restarter but mark them as stale
and use them for packet forwarding. During the GR process, packet forwarding is not
interrupted.
After the active/standby switchover is completed, the GR restarter re-establishes a GR session
3.
with the GR helper. If no BGP session is established within the interval set with the
graceful-restart timer restart command, the GR helper removes the stale routes.
If a BGP session is established, routing information is exchanged between them for the GR
4.
restarter to retrieve route entries, and for the GR helper to recover stale routes. You can control
the routing information exchange interval by configuring the graceful-restart timer wait-for-rib
command. If routing information exchange is not completed within the time, the GR restarter
does not receive new routes; instead, it updates its routing table and forwarding table with the
Command
confederation id as-number
confederation peer-as
as-number-list
Command
system-view
bgp as-number
confederation nonstandard
230
Remarks
Not configured by default.
Not configured by default.
Remarks
N/A
N/A
Optional.
Not enabled by default.