[c-nsp] Cisco 7600 and 'show mfib' commands

[John Neiberger]

Thanks for the link, Pete. That's very helpful!

John


On Tue, Jul 29, 2014 at 8:49 AM, Pete Lumbis <alumbis at gmail.com> wrote:

> MFIB was added in 12.4.24T (or maybe 15.0M) and...I want to say SRD code.
> You can think of it like multicast CEF. Just like the RIB builds FIB,
> mroute builds mfib.  It's also the code where you see the pim tunnel
> interfaces for encap (on the FHR) and decap (on the RP).
>
> This might be helpful.
>
> http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_mfib/configuration/xe-3s/Multicast_Forwarding_Information_Base_Overview.html
>
>
> On Tue, Jul 29, 2014 at 10:22 AM, John Neiberger <jneiberger at gmail.com>
> wrote:
>
>> This looks like a command that is new in 12.2(33)SRD or SRE. At my old
>> job,
>> all of our 7600s were running 12.2(33)SRC2. My new job has quite a variety
>> of code running. The box I'm on right now is running SRE code and does
>> have
>> these commands available. I'm just not sure what they're trying to tell
>> me.
>> They're quite different from the mfib commands availalbe on XR, for
>> example. It seems to be providing additional information related to the
>> state of distributed multicast forwarding, but I have no idea about the
>> specifics. For example, what is a broker in this context?
>>
>> router#show mfib linecard
>>
>> IPv4 MFIB
>>  Slot     Linecard status    Broker status
>>  3/0      inactive           inactive
>>  2/0      inactive           inactive
>>  1/0      sync               enabled
>>
>> IPv6 MFIB
>>  Slot     Linecard status    Broker status
>>
>> IPv4:Default, 29 entries, 33 ioitems
>> Slot      Table state
>> 1/0       Sync
>>
>>
>> router#show mfib linecard summary
>>
>> IPv4 MFIB
>>  Slot     Linecard status    Broker status
>>  3/0      inactive           inactive
>>  2/0      inactive           inactive
>>  1/0      sync               enabled
>>
>> router#show mfib ?
>>   background  MFIB background processing
>>   broker      MFIB information related to update brokers
>>   error       MFIB error state
>>   linecard    MFIB information related to linecards
>>   nsf         MFIB SSO NSF statistics
>>   state       MFIB state
>>   table       MFIB master table record
>>   timers      MFIB timers
>>
>>   <cr>
>>
>> router#show mfib state
>> MFIB Status:
>>  RP instance
>> IPv4 MFIB Status:
>>  Enable state:                       distributed enabled
>>  Running state:                      running distributed
>> IPv6 MFIB Status:
>>  Enable state:                       disabled
>>  Running state:                      not running
>> RRP HA state:
>>  Is standby RRP:                     no
>>  RF Peer Presence:                   no
>>  RF PeerComm reached:                no
>>  Redundancy mode:                    sso(3)
>>  IPv4 MFIB NSF sync:                 disabled/not running
>>  IPv6 MFIB NSF sync:                 disabled/not running
>>
>> MFIB ISSU Status:
>>   MFIB IPv4 pull
>>     No slots are ISSU capable.
>>
>>
>> router#show mfib table
>> 1 active IPv4 table
>> Table                     Entries  State         Flags
>> v4:Default                     29  Sync          DEF,LCS,CEN,CON,EOF,PRG
>>
>>
>>
>>
>> On Mon, Jul 28, 2014 at 7:50 PM, Tony <td_miles at yahoo.com> wrote:
>>
>> > Hi John,
>> >
>> > Yes, mfib = multicast FIB.
>> >
>> > Are the boxes in question running multicast ?  (hint: "show run | i
>> > multicast")
>> >
>> > What were the previous tickets about (or opened for) ?
>> >
>> > I'm not sure why they would be used for anything other than
>> > troubleshooting multicast traffic, it could be specific to a linecard if
>> > that was the problem encountered.
>> >
>> >
>> > regards,
>> > Tony.
>> >
>> >
>> >   ------------------------------
>> >  *From:* John Neiberger <jneiberger at gmail.com>
>> > *To:* "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>
>> > *Sent:* Tuesday, 29 July 2014 2:47 AM
>> > *Subject:* [c-nsp] Cisco 7600 and 'show mfib' commands
>>
>> >
>> > I'm at a new job and was looking at a few recent trouble tickets. I see
>> > that TAC had them use variations of the 'show mfib' commands, like 'show
>> > mfib linecard summary'. At my previous job, we had a few hundred 7600s
>> but
>> > I don't recall TAC ever directing us to use those commands. I took a
>> peek
>> > at them and it's not clear what I'm looking at.
>> >
>> > When I see mfib, I assume multicast FIB. I can't really tell if that's
>> what
>> > I'm looking at or not, or the significance of the commands.
>> >
>> > I wasn't able to find much good info about these commands on CCO. Do
>> any of
>> > you have any idea what these are really looking at? It seems that they
>> > might be useful for troubleshooting linecard issues but I'm entirely
>> > unfamiliar with them.
>> > _______________________________________________
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>> >
>> >
>> >
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