3Com S7906E - Switch, Configuration Manual

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1-12
To do… Use the command… Remarks
Enable the comparison of MED
for routes from each AS
bestroute compare-med
Optional
Disabled by default
Enable the comparison of MED
for routes from confederation
peers
bestroute med-confederation
Optional
Disabled by default
Configuring the AS_PATH Attribute
Follow these steps to configure the AS_PATH attribute:
To do… Use the command… Remarks
Enter system view system-view
—
Enter BGP view bgp as-number
—
Enter IPv6 address family view ipv6-family
—
Allow the local AS number to
appear in AS_PATH of routes
from a peer/peer group and
specify the repeat times
peer { ipv6-group-name |
ipv6-address } allow-as-loop
[ number ]
Optional
Not allowed by default
Specify a fake AS number for
an IPv6 peer/peer group
peer { ipv6-group-name |
ipv6-address } fake-as
as-number
Optional
Not specified by default.
Disable IPv6 MBGP from
considering the AS_PATH
during best route selection
bestroute as-path-neglect
Optional
Enabled by default.
Configure to carry only the
public AS number in updates
sent to a peer/peer group
peer { ipv6-group-name |
ipv6-address } public-as-only
Optional
By default, IPv6 BGP updates
carry private AS number.
Substitute the local AS number
for the AS number of an IPv6
peer/peer group identified in
the AS_PATH attribute
peer { ipv6-group-name |
ipv6-address } substitute-as
Optional
Not substituted by default
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.
z
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.
z
IPv6 BGP connection soft reset