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Cisco Bug: CSCun07423 - Topaz Multipath, per-ce : 50%traffic drop across intra vrf at same PE

Last Modified

Aug 07, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.1.3.LC

Description (partial)

Symptom:
In CRS X , if we have eibgp multipath configured in PE(CRSX with Line card as 40x10GE)   with per ce label mode   ,and if there is a Intra Vrf  ipv4  traffic between 2 CEs , i.e from one CE1 in one vrf to other CE2 in same vrf  and CE2  is dual homed(which has ebgp path and ibgp path), then 50% traffic drops in ebgp path on its way to CE2 and only 50% traffic goes via ibgp to reach the dual homed CE2.

Conditions:
Eibgp multipath configuration in PE (CRSX) with participating LC as 40x10GE , Per ce label mode in PE and when Intra vrf traffic comes from one Ce to other Ce which is dual homed.
sample configuration:
router bgp <>
 vrf v801
  rd 100:801
  address-family ipv4 unicast
   maximum-paths eibgp 10
   label mode per-ce
  !
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