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Cisco Bug: CSCus44940 - BGP process crash during vrf migration

Last Modified

May 11, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.1.3.BASE

Description (partial)

Symptom:
BGP crashes when VRFs are added deleted via config/rollback/commit-replace etc.

RP/0/RSP0/CPU0:DC4R902#show run int TenGigE0/0/0/13.1
Mon Dec  8 15:39:40.729 PST
interface TenGigE0/0/0/13.1
 description Connection 10GE to DC4R601 SVI VLAN2403 for VRF_DCBB
 vrf VRF_DCBB_EMEA

And ran " DC4R901#rollback configuration to import-vrf3"

BGP crashed.

RP/0/RSP1/CPU0:Jan  9 11:43:14.515 PST: dumper[60]: %OS-DUMPER-5-CORE_TRANSFER_STATUS : Transfer of Core file from harddisk:/dumper/first.bgp_1054.by.bgp.sparse.20150109-114241.node0_RSP1_CPU0.x86.Z to harddisk:/coredump/bgp_1054.by.bgp.sparse.20150109-114241.20150109-114248.node0_RSP1_CPU0.x86.Z on local_node suceeded.
RP/0/RSP1/CPU0:Jan  9 11:43:15.991 PST: dumper[60]: %OS-DUMPER-6-CORE_MD5 : harddisk:/coredump/bgp_1054.by.bgp.sparse.20150109-114241.20150109-114248.node0_RSP1_CPU0.x86.Z after transfer. size:8272785 md5:8a035c4182a8419f3e7b2b44c1e2a856

Conditions:
Create a new vrf and apply it to an interface running with an existing vrf. The condition is that RTs are exported via "route-policy" from one VRF and are imported into another VRF via "route-policy". Then this bug triggers.

rollback file:

RP/0/RSP1/CPU0:DC4R901#show configuration rollback changes to  import-vrf3
Fri Jan  9 14:51:50.820 PST
Building configuration...
!! IOS XR Configuration 5.1.3
no vrf VRF_DCBB_EMEA
interface TenGigE0/0/0/13.1
 description Connection 10GE to DC4R601 SVI VLAN2401 for VRF_DCBB
 no vrf VRF_DCBB_EMEA
 vrf VRF_DCBB
 ipv4 mtu 9000
 no ipv4 address 169.65.4.0 255.255.255.254
 ipv4 address 169.65.4.0 255.255.255.254
 load-interval 30
 dampening 1 100 1500 4
 encapsulation dot1q 2401
!
!
prefix-set PS_INTERNAL_NETWORK_70X
  #list of VRF_DCBB_NETWORK
  167.84.204.0/24 le 32,
  169.124.64.0/20 le 32,
  169.65.0.0/16 le 32,
  155.0.0.0/8 le 32,
  167.84.13.91/32,
  167.84.13.92/32,
  167.84.72.79/32,
  167.84.72.80/32,
  167.84.96.82/32,
  167.84.96.81/32,
  167.84.96.32/32,
  167.84.96.31/32,
  10.101.0.0/16 le 32,
  10.103.0.0/16 le 32,
  10.104.0.0/16 le 32,
  10.105.0.0/16 le 32,
  10.106.0.0/16 le 32,
  10.107.0.0/16 le 32,
  10.102.0.0/16 le 32,
  10.202.0.0/16 le 32,
  10.201.0.0/16 le 32,
  10.210.0.0/16 le 32,
  201.0.0.0/8 le 32,
  155.180.8.202/32,
  155.181.8.202/32,
  10.2.0.0/16 le 24,
  10.3.0.0/16 le 24,
  10.4.0.0/16 le 24,
  10.5.0.0/16 le 24,
  10.6.0.0/16 le 24,
  10.7.0.0/16 le 24,
  10.238.0.0/16 le 24,
  10.239.0.0/16 le 24
end-set
!
router bgp 65400
 vrf VRF_DCBB
  neighbor 169.65.4.1
   remote-as 65141
   use neighbor-group NG_CRITICAL_SITES_DATA_CENTER_ROUTES_PLUS_DEFAULT_NO_BFD
   description BGP neighbor AS-65141 DC4R601
   address-family ipv4 unicast
    route-policy RP_CRITICAL_SITES_DATA_CENTER_ROUTES_PLUS_DEFAULT_70X out
   !
  !
 !
 no vrf VRF_DCBB_EMEA
 vrf VRF_DCBB_EMEA
  no rd 167.84.204.41:3
  no address-family ipv4 unicast
  address-family ipv4 unicast
   no maximum-paths ebgp 8
   no maximum-paths ibgp 8
   no aggregate-address 169.65.4.0/25 summary-only
   no redistribute connected route-policy RP_CONNECTED_TO_BGP
   no redistribute static route-policy RP_STATIC_TO_BGP
  !
  no neighbor 169.65.4.1
  neighbor 169.65.4.1
   no remote-as 65141
   no use neighbor-group NG_CRITICAL_SITES_DATA_CENTER_ROUTES_PLUS_DEFAULT_NO_BFD
   no description BGP neighbor AS-65141 DC4R601
   no address-family ipv4 unicast
   address-family ipv4 unicast
    no route-policy RP_CRITICAL_SITES_DATA_CENTER_ROUTES_PLUS_DEFAULT_70X out
   !
  !
 !
!
multicast-routing
 vrf VRF_DCBB
  address-family ipv4
   mdt mtu 9000
   mdt data 232.41.255.0/24
   no mdt default ipv4 232.0.0.1
   mdt default ipv4 232.0.0.1
  !
 !
 no vrf VRF_DCBB_EMEA
 vrf VRF_DCBB_EMEA
  no address-family ipv4
  address-family ipv4
   no mdt mtu 9000
   no mdt data 232.137.3.0/24
   no mdt default ipv4 232.0.0.1
   no rate-per-route
   no interface all enable
   no accounting per-prefix
  !
 !
!
multicast-routing
!
router pim
 vrf VRF_DCBB
  address-family ipv4
   interface TenGigE0/0/0/13.1
    enable
   !
  !
 !
 no vrf VRF_DCBB_EMEA
 vrf VRF_DCBB_EMEA
  address-family ipv4
   no rp-address 10.100.100.100 AL_MC_MDS_GROUP override
   no interface TenGigE0/0/0/13.1
   interface TenGigE0/0/0/13.1
    no enable
   !
  !
 !
!
router pim
!
end
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