R3102-R3103-HP 6600/HSR6600 Routers Layer 3 - IP Routing Configuration Guide

234
information, the router filters the routing information by using the new policy.
This method requires that both the local router and the peer support route refresh.
• Manual soft-reset—Use the peer keep-all-routes command to save all route updates from the peer.
After modifying the route selection policy, use the refresh bgp command to filter routing information
by using the new policy.
This method uses more memory resources to save routes and does not require that the local router
and the peer support route refresh.
Configuring automatic soft-reset
After route refresh is enabled for peers and a policy is modified, the router advertises a route-refresh
message to the peers, which then resend their routing information to the router. After receiving the routing
information, the router performs dynamic route update by using the new policy.
To enable BGP route refresh for a peer or peer group:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family vpn-instance
vpn-instance-name
Use either method.
3. Enable BGP route refresh for a
peer or peer group.
peer { group-name | ip-address }
capability-advertise route-refresh
Optional.
Enabled by default.
Configuring manual soft-reset
If a BGP peer does not support route-refresh, you must save updates from the peer on the local router by
using the peer keep-all-routes command, and use the refresh bgp command to refresh the BGP routing
table.
If the BGP peer does not support route-refresh and the peer keep-all-routes command is not configured
on the local end, you must decide whether to manually disconnect the session with the peer to learn
routes again according to the impact of the new policy.
To save all route updates from a peer or peer group:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view or BGP-VPN
instance view.
• Enter BGP view:
bgp as-number
• Enter BGP-VPN instance view:
a. bgp as-number
b. ipv4-family vpn-instance
vpn-instance-name
Use either method.
3. Save all route updates from a
peer or peer group.
peer { group-name | ip-address }
keep-all-routes
Not saved by default.
4. Return to user view.
return N/A