[c-nsp] SUP720 TFIB scan not completing

[Christian Bering]

Rodney (and Ian),

Thanks for your replies.

>You can try a 'sh ip cef events' and see if you see a /32 adjacency
>entry constantly changing. That will cause us to run the TFIB scanner
>which piggybacks on the CEF scanner.

I do see a few showing up repeatedly:

CEF table events (storage for 10000 events, 15578 events recorded)
+00:00:00.000: [Internet] zyx.168.184.0/24      NBD modified
[OK]
+00:00:00.200:           xyz.17.206.3/32'00    ADJ (Vl488) update
[OK]
+00:00:00.448:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:00.448:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:00.448:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:00.448:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:00.448:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:00.448:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:00.816: [Default] 127.0.0.51/32'00      Quash overriding adjfib
[OK]
+00:00:00.816:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:01.028:           192.168.1.19/32'00    ADJ (Vl20) update
[OK]
+00:00:01.456:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:01.456:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:01.456:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:01.456:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:01.456:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:01.456:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:02.068:           192.168.1.19/32'00    ADJ (Vl20) update
[OK]
+00:00:02.068:           192.168.1.19/32'00    ADJ (Vl20) update
[OK]
+00:00:02.376:           xy.218.190.25/32'00   ADJ (Vl321) update
[OK]
+00:00:02.480:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:02.480:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:02.480:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:02.480:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
+00:00:02.480:           1xx.136.88.28/32'00   ADJ (Vl412) update
[OK]
+00:00:02.480:           1xx.136.88.28/32'00   ADJ (Vl412) incompl.
[OK]
[snip]
+00:00:00.420:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]
+00:00:00.420:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]
+00:00:00.420:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]
+00:00:00.420:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]
+00:00:00.420:           192.168.1.19/32'00    ADJ (Vl20) update
[OK]
+00:00:00.420:           10.6.10.121/32'00     ADJ (Vl417) update
[OK]
+00:00:00.780:           10.6.10.102/32'00     ADJ (Vl417) update
[OK]
+00:00:00.988:           10.6.10.108/32'00     ADJ (Vl417) update
[OK]
+00:00:01.200:           172.17.1.20/32'00     ADJ (Vl410) update
[OK]
+00:00:01.416:           1xx.136.90.2/32'00    ADJ (Vl308) update
[OK]
+00:00:01.416:           192.168.1.19/32'00    ADJ (Vl20) update
[OK]
+00:00:01.416:           192.168.1.19/32'00    ADJ (Vl20) update
[OK]
+00:00:01.416:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]
+00:00:01.416:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]
+00:00:01.420:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]
+00:00:01.420:           1xx.136.95.4/32'00    ADJ (Vl306) update
[OK]

Especially 1xx.136.88.28/32 in Vl412 and 1xx.136.95.4/32 in Vl306 have
many occurances of the above kind.

>We improved this with:

>CSCsb16512
>Externally found moderate defect: Resolved (R)
>High CPU in CEF Process and CEF scanner due to prefix reresolve

As I read it, it shouldn't be an issue in SXE? 

>You can correlate 'sh ip cef events' to a debug mpls lfib cef
>and try to figure out if a mac is constantly changing on one of the
>mpls enabled interfaces.

Tried that, but neither show much about MAC addresses. Can the Traceback
output can be interpreted in some way as a MAC address?

Jan 25 01:48:45.099 MET: %TFIB-7-SCANSABORTED: TFIB scan not completing.
MAC string updated.
-Traceback= 41EB455C 41EB48DC 405233CC 405240F0 40699230 406998BC
4069A4E0 4008AB54

Thanks,
Christian