Hello,
I have a very strange problem on my ASR-1006 BRAS router.
This router is having two equal paths toward a P router via IS-IS. The BRAS is seeing the P router over the two paths and the two paths are installed in the RIB and FIB as follows:
bng.rams.ca.asr1#sh ip cef 10.10.10.141 internal
10.10.10.141/32, epoch 3, RIB[I], refcount 6, per-longest-match-prefix sharing
sources: RIB, LTE
feature space:
IPRM: 0x00028000
Broker: linked, distributed at 1st priority
LFD: 10.10.10.141/32 1 local label
local label info: global/592
contains path extension list
disposition chain 0x7FCE5CB8C440
label switch chain 0x7FCE5CB82FC0
ifnums:
GigabitEthernet0/0/0(8): 172.17.11.9
GigabitEthernet1/0/0(24): 172.17.11.17
path 7FCE67248388, path list 7FCE5FF51A40, share 1/1, type attached nexthop, for IPv4
MPLS short path extensions: MOI flags = 0x0 label implicit-null
nexthop 172.17.11.9 GigabitEthernet0/0/0, adjacency IP adj out of GigabitEthernet0/0/0, addr 172.17.11.9 7FCE5C406958
path 7FCE6724B5B8, path list 7FCE5FF51A40, share 1/1, type attached nexthop, for IPv4
MPLS short path extensions: MOI flags = 0x0 label implicit-null
nexthop 172.17.11.17 GigabitEthernet1/0/0, adjacency IP adj out of GigabitEthernet1/0/0, addr 172.17.11.17 7FCE5079A540
output chain: IP adj out of GigabitEthernet0/0/0, addr 172.17.11.9 7FCE5C406958
The problem is, CEF is seeing the two paths equal, but the output chain is only having one exit interface and the traffic is traversing this interface only!
This is the interface config:
bng.rams.ca.asr1#sh run all | sec 0/0/0
interface GigabitEthernet0/0/0
description "Connected to p1 router"
mtu 1600
ip address 172.17.11.10 255.255.255.252
ip redirects
ip unreachables
ip proxy-arp
ip mtu 1600
no ip load-sharing per-longest-match-prefix
ip cef accounting non-recursive internal
ip router isis
ip flow monitor adsl input
ip flow monitor adsl output
ip pim dr-priority 1
ip pim query-interval 30
ip mfib forwarding input
ip mfib forwarding output
ip mfib cef input
ip mfib cef output
ip route-cache cef
ip route-cache
ip split-horizon
ip igmp last-member-query-interval 1000
ip igmp last-member-query-count 2
ip igmp query-max-response-time 10
ip igmp version 2
ip igmp query-interval 60
ip igmp tcn query count 2
ip igmp tcn query interval 10
interface GigabitEthernet1/0/0
description " Connected to p1 router"
mtu 1600
ip address 172.17.11.18 255.255.255.252
ip redirects
ip unreachables
ip proxy-arp
ip mtu 1600
no ip load-sharing per-longest-match-prefix
ip cef accounting non-recursive internal
ip router isis
ip flow monitor adsl input
ip flow monitor adsl output
ip pim dr-priority 1
ip pim query-interval 30
ip mfib forwarding input
ip mfib forwarding output
ip mfib cef input
ip mfib cef output
ip route-cache cef
ip route-cache
ip split-horizon
ip igmp last-member-query-interval 1000
ip igmp last-member-query-count 2
ip igmp query-max-response-time 10
ip igmp version 2
ip igmp query-interval 60
ip igmp tcn query count 2
ip igmp tcn query interval 10
So, what do you think?
Regards,
Mohamed Kamal