F3215-HP Load Balancing Module Network Management Configuration Guide-6PW101
417
After establishing an IPv6 BGP connection, two routers send keepalive messages periodically to
each other to maintain the connection. If a router receives no keepalive message from the peer
after the holdtime elapses, it tears down the connection.
When establishing an IPv6 BGP connection, the two parties compare their holdtimes, taking the
shorter one as the common holdtime. If the holdtime is 0, neither keepalive message is sent, nor
holdtime is checked.
• IPv6 BGP connection soft reset
After modifying a route selection policy, reset IPv6 BGP connections to make the new one take
effect. The current IPv6 BGP implementation supports the route-refresh feature that enables
dynamic route refresh without needing to disconnect IPv6 BGP links.
After this feature is enabled on all IPv6 BGP routers, a router that wants to apply a new route
selection policy advertises a route-refresh message to its peers, which then send their routing
information to the router. After receiving the routing information, the router can perform dynamic
route update by using the new policy without tearing down connections.
If a peer not supporting route-refresh exists in the network, configure the peer keep-all-routes
command to save all routes from the peer. When the routing policy is changed, the system will
update the IPv6 BGP routing table and apply the new policy.
Configuration prerequisites
Before you configure IPv6 BGP timers, complete the following tasks:
• Enable IPv6.
• Configure IPv6 BGP basic functions.
Configuring IPv6 BGP timers
To configure IPv6 BGP timers:
Ste
p
Command
Remarks
1. Enter system view. system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Enter IPv6 address family
view.
ipv6-family N/A
4. Configure IPv6 BGP timers.
• Specify keepalive interval and
holdtime:
timer keepalive keepalive hold
holdtime
• Configure keepalive interval and
holdtime for an IPv6 peer or peer
group:
peer { ipv6-group-name |
ipv6-address } timer keepalive
keepalive hold holdtime
Optional.
The keepalive interval
defaults to 60 seconds,
holdtime defaults to 180
seconds.
Timers configured by using
the timer command have
lower priority than timers
configured by using the peer
timer command.
The holdtime interval must be
at least three times the
keepalive interval.