Scenario:
I'm aggregating my address range to eBGP peer using aggregate-address. However,
I'm multi-homed to said peer, and I need to advertise a preference (MED or
as-path) to said peer via the multiple paths.
---------
router bgp 36193
!
address-family ipv4 vrf bats
neighbor X.Y.Z.A remote-as G
neighbor 10.196.61.1 activate
neighbor 10.196.61.1 soft-reconfiguration inbound
neighbor 10.196.61.1 route-map bgp-outbound-map out
no synchronization
aggregate-address A.B.C.D 255.255.255.192 as-set summary-only
exit-address-family
route-map bgp-outbound-map permit 10
match ip address prefix-list outbound-pub-prefixes
set metric 49152
set as-path prepend last-as 3
-----------
I would think that the route-map should apply to the aggregate summary address
- but it doesn't.
I can influence the metric by setting
--------
route-map set-unpref-map
set metric 49152
aggregate-address A.B.C.D 255.255.255.192 as-set summary-only attribute-map
set-unpref-map
-------
which for the purpose at hand is sufficient, but not all my peers honor MED.
I can use a null-route plus a network statement, sure, but that is less than
ideal for my purposes.
Is there any way to artificially extend an as-path on an aggregate address?
Thanks,
-bacon
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