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Cisco Bug: CSCuj61751 - /30 prefix is treated as broadcast in RIP

Last Modified

May 09, 2018

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

4.3.1.ROUT

Description (partial)

Symptom:
a.b.c.d/30(and several others with /30) is not learned via RIPv2 over L2VPN on ASR9K because it interprets this prefix as broadcast address and not accepting it even though that is not broadcast address.

RP/0/RSP0/CPU0:Aug 19 21:58:12.043 : rip[1042]: Received v2 update from a.b.c.d on GigabitEthernet0_0_0_x with dest=224.0.0.9
RP/0/RSP1/CPU0:Aug 19 21:58:12.044 : rip[1042]: ignoring packet since the node is not active
RP/0/RSP0/CPU0:Aug 19 21:58:12.043 : rip[1042]:   send port=520, receive port=520, packet length=24
RP/0/RSP0/CPU0:Aug 19 21:58:12.043 : rip[1042]:   command=2, version=2, mbz=0,
RP/0/RSP0/CPU0:Aug 19 21:58:12.043 : rip[1042]:   authentication method: none, route count=1

RP/0/RSP0/CPU0:Aug 19 21:58:12.043 : rip[1042]:   AFI=2, tag=0, metric=1, prefix=x.x.x.x/30
RP/0/RSP0/CPU0:Aug 19 21:58:12.043 : rip[1042]: Validating received route x.x.x.x/255.255.255.252 (nh=0.0.0.0, metric=0x1, tag=0x0)
RP/0/RSP0/CPU0:Aug 19 21:58:12.043 : rip[1042]: Bad route prefix (broadcast address) x.x.x.x/30 from a.b.c.d

Conditions:
Only occurs with Intel process (RSP440).
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