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Cisco Bug: CSCuo87783 - RTfilter NLRI with ASN 0 is working as default one

Last Modified

Apr 18, 2019

Products (13)

  • Cisco IOS
  • Cisco 7206 Router
  • Cisco 7301 Router
  • Cisco 7204 Router
  • Cisco 7206VXR Router
  • Cisco 7202 Router
  • Cisco 7600 Series Route Switch Processor 720 with Multilayer Switch Feature Card
  • Cisco 7600 Series Route Switch Processor 720 with 10 Gigabit Ethernet Uplinks
  • Cisco 7200 Series NPE-G2 Network Processing Engine
  • Cisco 7600 Series Supervisor Engine 32 with Multilayer Switch Feature Card
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Known Affected Releases

15.1(3)S5

Description (partial) 

Symptom:
If rtfilter NLRI received by RR has AS number 0, then default filtering enabled to that sender and every vpnv4 prefix is advertised without filtering.

Conditions:
rtfilter NLRI received by RR has AS number 0, e.g.:

RND-61-004-BB91#sh ip bgp rtfilter all
BGP table version is 104, local router ID is 10.250.70.0
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale, m multipath, b backup-path, x best-external, f RT-Filter, a additional-path
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*>i0:2:64861:11     10.250.69.34                  100  32768 i
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