11-10-2020 02:49 PM
Hello,
We have a problem with our ASR 9001 config. The full BGP table (global 800k prefixes) is not present in the RIP "sh ip route" table:
RP/0/RSP0/CPU0:CR1#sh ip route Tue Nov 10 15:43:24.954 UTC Codes: C - connected, S - static, R - RIP, B - BGP, (>) - Diversion path D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - ISIS, L1 - IS-IS level-1, L2 - IS-IS level-2 ia - IS-IS inter area, su - IS-IS summary null, * - candidate default U - per-user static route, o - ODR, L - local, G - DAGR, l - LISP A - access/subscriber, a - Application route M - mobile route, r - RPL, t - Traffic Engineering, (!) - FRR Backup path Gateway of last resort is not set C 10.0.2.0/24 is directly connected, 00:37:51, TenGigE0/0/2/2 L 10.0.2.1/32 is directly connected, 00:37:51, TenGigE0/0/2/2 C 10.0.3.0/24 is directly connected, 00:37:51, TenGigE0/0/2/3 L 10.0.3.1/32 is directly connected, 00:37:51, TenGigE0/0/2/3
RP/0/RSP0/CPU0:CR1#sh ip bgp summary Tue Nov 10 15:43:52.907 UTC BGP router identifier 193.46.254.1, local AS number 47890 BGP generic scan interval 60 secs Non-stop routing is enabled BGP table state: Active Table ID: 0xe0000000 RD version: 6 BGP main routing table version 6 BGP NSR Initial initsync version 2 (Reached) BGP NSR/ISSU Sync-Group versions 0/0 BGP scan interval 60 secs BGP is operating in STANDALONE mode. Process RcvTblVer bRIB/RIB LabelVer ImportVer SendTblVer StandbyVer Speaker 6 6 6 6 6 0 Neighbor Spk AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down St/PfxRcd 10.0.2.2 0 47890 1410896 1362 6 0 0 01:52:16 813016
The 9001 is a Core router. We are doing iBGP with our border routers which accept prefixes from our upstream providers (ASR 1002-x). Also the sh ip bgp command shows:
RP/0/RSP0/CPU0:CR1#sh ip bgp Tue Nov 10 15:45:34.664 UTC BGP router identifier 193.46.254.1, local AS number 47890 BGP generic scan interval 60 secs Non-stop routing is enabled BGP table state: Active Table ID: 0xe0000000 RD version: 6 BGP main routing table version 6 BGP NSR Initial initsync version 2 (Reached) BGP NSR/ISSU Sync-Group versions 0/0 BGP scan interval 60 secs Status codes: s suppressed, d damped, h history, * valid, > best i - internal, r RIB-failure, S stale, N Nexthop-discard Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path * i1.0.0.0/24 89.136.224.185 0 100 0 6830 6453 13335 i * i1.0.4.0/22 89.136.224.185 0 100 0 6830 3257 4826 38803 i * i1.0.4.0/24 89.136.224.185 0 100 0 6830 3257 4826 38803 i * i1.0.5.0/24 89.136.224.185 0 100 0 6830 3257 4826 38803 i * i1.0.6.0/24 89.136.224.185 0 100 0 6830 3257 4826 38803 i * i1.0.7.0/24 89.136.224.185 0 100 0 6830 3257 4826 38803 i * i1.0.16.0/24 89.136.224.185 0 100 0 6830 174 2519 i * i1.0.64.0/18 89.136.224.185 0 100 0 6830 2497 7670 18144 i * i1.0.128.0/17 89.136.224.185 0 100 0 6830 6453 38040 23969 i * i1.0.128.0/18 89.136.224.185 0 100 0 6830 6453 38040 23969 i * i1.0.128.0/19 89.136.224.185 0 100 0 6830 6453 38040 23969 i * i1.0.128.0/24 89.136.224.185 0 100 0 6830 3356 38040 23969 i * i1.0.129.0/24 89.136.224.185 0 100 0 6830 2914 4651 23969 i
=> and goes on and on for 800k routes
Howver, sh bgp convergence shows:
RP/0/RSP0/CPU0:CR1#sh bgp convergence Tue Nov 10 15:46:04.351 UTC Converged. All received routes in RIB, all neighbors updated. All neighbors have empty write queues.
Thanks!
11-10-2020 03:14 PM
Next hop self in IBGP,
your next hop not know for core with next hop self we make next hop change to be know for core
11-10-2020 03:31 PM
I think i already have that implemented:
router bgp 99999 bgp router-id 193.46.xx.1 default-information originate bgp redistribute-internal bgp log neighbor changes detail address-family ipv4 unicast network 193.46.xx.0/24 backdoor ! neighbor 10.0.2.2 remote-as 99999 description 1002-x-local update-source TenGigE0/0/2/2 address-family ipv4 unicast maximum-prefix 1000000 5 warning-only capability orf prefix both next-hop-self soft-reconfiguration inbound always ! ! neighbor 10.0.3.2 remote-as 99999 shutdown description 1002-x-orange update-source TenGigE0/0/2/3 address-family ipv4 unicast maximum-prefix 850000 75 warning-only next-hop-self ! !
11-10-2020 03:53 PM - edited 11-10-2020 04:26 PM
Ok,
ASR (9999)-ibgp(9999)
when we config next hop self in asr 196...... we see effect on other ibgp.
But to see all route in rib of asr 196...... we need to make next hop reachable for it.
In your case I think asr 196.... is ebgp with next hop 89..... and also this next hop is not direct connect I.e. not p2p.
so you need Static route toward it.
11-10-2020 07:41 PM - edited 11-10-2020 07:42 PM
In this scenario, next-hop-self needs to be applied on the border router (ASR 1002-x), on the neighbor towards the ASR9001. This should fix the issue.
Regards,
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