Configuring The As_Path Attribute; Tuning And Optimizing Ipv6 Bgp Networks - 3Com S7906E Configuration Manual

To do...
Enable the comparison of MED
for routes from each AS
Enable the comparison of MED
for routes from confederation
peers

Configuring the AS_PATH Attribute

Follow these steps to configure the AS_PATH attribute:
To do...
Enter system view
Enter BGP view
Enter IPv6 address family view
Allow the local AS number to
appear in AS_PATH of routes
from a peer/peer group and
specify the repeat times
Specify a fake AS number for
an IPv6 peer/peer group
Disable IPv6 MBGP from
considering the AS_PATH
during best route selection
Configure to carry only the
public AS number in updates
sent to a peer/peer group
Substitute the local AS number
for the AS number of an IPv6
peer/peer group identified in
the AS_PATH attribute

Tuning and Optimizing IPv6 BGP Networks

This section describes configurations of IPv6 BGP timers, IPv6 BGP connection soft reset and the
maximum number of load balanced routes.
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 holdtimes, 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
Use the command...
bestroute compare-med
bestroute med-confederation
Use the command...
system-view
bgp as-number
ipv6-family
peer { ipv6-group-name |
ipv6-address } allow-as-loop
[ number ]
peer { ipv6-group-name |
ipv6-address } fake-as
as-number
bestroute as-path-neglect
peer { ipv6-group-name |
ipv6-address } public-as-only
peer { ipv6-group-name |
ipv6-address } substitute-as
1-12
Remarks
Optional
Disabled by default
Optional
Disabled by default
Remarks
—
—
—
Optional
Not allowed by default
Optional
Not specified by default.
Optional
Enabled by default.
Optional
By default, IPv6 BGP updates
carry private AS number.
Optional
Not substituted by default