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

[Pete Lumbis]

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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