Cisco ASR 9010 Error

[Bilal Raziq]

Hi All

Playing around with EBGP XOR ver 5.1.3 ....I got some below log messages ..Everything is fine as far as routing and traffic is concerned ..A friend told me its a bug ..i couldn't find anything on it ..Please share your thoughts

LC/0/1/CPU0:Dec 28 00:38:25.991 : fib_mgr[184]: %ROUTING-FIB-5-ROUTE_UPDATE_DROP : FIB dropping route update: LABEL-RECYCLING: label=36682 new-prefix=172.30.155.160/29, tbl=UP, old-prefix=0.0.0.0/0, tbl=GN,  lcnt=1, rt-src=6
LC/0/0/CPU0:Dec 28 00:38:26.097 : fib_mgr[184]: %ROUTING-FIB-5-ROUTE_UPDATE_DROP : FIB dropping route update: LABEL-RECYCLING: label=36682 new-prefix=172.30.155.160/29, tbl=UP, old-prefix=0.0.0.0/0, tbl=GN,  lcnt=1, rt-src=6

Regards

Bilal

[smailmilak · Accepted solution]

Hi Bila,

check out this link (CCO needed). Do an upgrade to 5.3.4 if possible. We have upgraded around 8 devices because of several bugs on previous versions.

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCun29482

Symptom:
RP/0/RSP0/CPU0:Mar 3 16:19:10.009 : fib_mgr[221]: %ROUTING-FIB-5-ROUTE_UPDATE_DROP : FIB dropping route update: LABEL-RECYCLING: label=120734 new-prefix=192.0.48.0/24, tbl=red445, old-prefix=202.153.144.26/32, tbl=default, lcnt=1, rt-src=6

This results in the new-prefix being incorrectly programmed in CEF or missing.

Conditions:
May occur under the following conditions:
- A /32 prefix (mentioned in old-prefix) is present as a result of an attached route in RIB out of a multi-access interface; and
- LDP has advertised the prefix such that a local label has been allocated for it; and
- An RP switchover has happened in the past where after switchover the prefix stopped being advertised for some reason.

Workaround:
Use a different length prefix if possible to avoid the issue. After the issue occurs perform "clear cef linecard loc <>" to clear the stale CEF information and reprogram.