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958 CHAPTER 72: BGP CONFIGURATION COMMANDS
Description Use the compare-different-as-med command to enable the comparison of the
MED for paths from peers in different ASs.
Use the
undo compare-different-as-med command to disable the
comparison.
The comparison is disabled by default.
If there are several paths for one destination available, the path with the smallest
MED is selected.
Do not use this command unless associated ASs adopt the same IGP protocol and
routing selection method.
Examples # In BGP view, enable to compare the MED for paths from peers in different ASs.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] compare-different-as-med
# In BGP-VPN instance view, enable to compare the MED for paths from peers in
different ASs (The VPN has been created).
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family vpn-instance vpn1
[Sysname-bgp-vpn1] compare-different-as-med
confederation id
Syntax confederation id as-number
undo confederation id
View BGP view
Parameters as-number: Number of the AS that contains multiple sub-ASs, in the range 1 to
65535.
Description Use the
confederation id command to configure a confederation ID.
Use the
undo confederation id command to remove a specified confederation.
By default, no confederation ID is configured.
Configuring a confederation can reduce IBGP connections in a large AS. You can
split the AS into several sub-ASs, and each sub-AS remains fully meshed. These
sub-ASs form a confederation. Key IGP attributes of a route, such as the next hop,
MED, local preference, are not discarded when crossing each sub-AS. The sub-ASs
still look like a whole from the perspective of other ASs. This can ensure the
integrity of the former AS, and solve the problem of too many IBGP connections in
the AS.