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

[John Neiberger]

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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