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Cisco Bug: CSCut51562 - NxOS puts only the first 2 AS# from the more specific paths in the as-se

Last Modified

Dec 12, 2017

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.0(2)A4(1)

Description (partial)

Symptom:
NxOS only puts the first 2 AS numbers from the more specific paths in the as-set of the aggregate we originate - and not all 4. If the first two paths are removed the other two AS-es are added to the as-set, and removed again/replaced when the paths come back up.

# sh bgp ipv4 uni
BGP routing table information for VRF default, address family IPv4 Unicast
BGP table version is 22755, local router ID is 172.16.0.1
Status: s-suppressed, x-deleted, S-stale, d-dampened, h-history, *-valid, >-best
Path type: i-internal, e-external, c-confed, l-local, a-aggregate, r-redist, I-injected
Origin codes: i - IGP, e - EGP, ? - incomplete, | - multipath, & - backup

Network Next Hop Metric LocPrf Weight Path
* i10.121.0.0/16 10.1.2.2 100 0 {64811 64831} ?
*>a 0.0.0.0 100 32768 {64811 64831} ? <== Aggregate
*>e10.121.7.1/32 10.1.3.2 50 0 64811 ?
*>i10.121.11.1/32 10.1.2.2 50 100 0 64831 ?
*>e10.121.224.0/27 10.1.7.2 1388 0 64651 ? <—— missing
*>e10.121.224.32/27 10.1.7.2 1388 0 64651 ?
*>i10.121.224.64/27 10.1.2.2 1388 100 0 64652 ? <—— missing
*>i10.121.224.96/27 10.1.2.2 1388 100 0 64652 ?

Conditions:
Nexus Switch is generating an Aggregate route that includes four or more Autonomous Systems . However, the Aggregate only includes the AS of two of the prefixes received instead of all the prefixes.
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