Configuring Ipv6 Bgp Timers; Prerequisites - 3Com MSR 50 Series Configuration Manual

Prerequisites

Configuring IPv6 BGP
Timers
After establishing an IPv6 BGP connection, two routers send keepalive messages
periodically to each other to keep 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
holdtime values, taking the shorter one as the common holdtime. If the holdtime
is 0, neither keepalive massage is sent, nor holdtime is checked.
IPv6 BGP connection soft reset
■
After modifying a route selection policy, you have to reset IPv6 BGP connections to
make the new one take effect, causing a short time disconnection. The current
IPv6 BGP implementation supports the route-refresh feature that enables dynamic
IPv6 BGP routing table refresh without needing to disconnect IPv6 BGP links.
With this feature enabled on all IPv6 BGP routers in a network, when a routing
policy modified on a router, the router advertises a route-refresh message to its
peers, which then send their routing information back to the router. Therefore, the
local router can perform dynamic routing information update and apply the new
policy without tearing down connections.
If a router not supporting route-refresh exists in the network, you need to
configure the peer keep-all-routes command on the router to save all route
updates, and then use the refresh bgp ipv6 command to soft-reset IPv6 BGP
connections.
Before configuring IPv6 BGP timers, you have:
Enabled IPv6 function
■
Configured IPv6 BGP basic functions
■
Follow these steps to configure IPv6 BGP timers:
To do...
Enter system view
Enter BGP view
Enter IPv6 address family view
Configure IPv6 Specify
BGP timers keepalive
interval and
holdtime
Configure
keepalive
interval and
holdtime for a
peer/peer group
Configure the interval for
sending the same update to a
peer/peer group
Adjusting and Optimizing IPv6 BGP Networks
Use the command...
system-view
bgp as-number
ipv6-family
timer keepalive keepalive
hold holdtime
peer { ipv6-group-name |
ipv6-address } timer
keepalive keepalive hold
holdtime
peer { ipv6-group-name |
ipv6-address }
route-update-interval
seconds
1025
Remarks
-
Required
-
Optional
The keepalive interval
defaults to 60 seconds,
holdtime defaults to 180
seconds.
Optional
The interval for sending the
same update to an IBGP peer
or an EBGP peer defaults to
15 seconds or 30 seconds