[c-nsp] Mysterious tunnel interfaces

[Tassos Chatzithomaoglou]

"sh ip pim tunnel" might give you more info.
In later releases i have seen two tunnels (pim encap/decap) created 
automatically.

--
Tassos

Ivan wrote on 12/08/2010 07:22:
>> I was working on a ISR 1941 with 15.0(1)M2.  I am running DMVPN on it
>> and using one tunnel interface.  (Tunnel 1).  No other tunnel
>> interfaces are configured on the router.  However when I do "show int
>> summary" I get this;
>>
>> #sh int summary
>>
>>   *: interface is up
>>   IHQ: pkts in input hold queue     IQD: pkts dropped from input queue
>>   OHQ: pkts in output hold queue    OQD: pkts dropped from output queue
>>   RXBS: rx rate (bits/sec)          RXPS: rx rate (pkts/sec)
>>   TXBS: tx rate (bits/sec)          TXPS: tx rate (pkts/sec)
>>   TRTL: throttle count
>>
>>    Interface              IHQ   IQD  OHQ   OQD  RXBS RXPS  TXBS TXPS TRTL
>> ------------------------------------------------------------------------
>> * GigabitEthernet0/0       0     0    0     0  6000    5  6000    5    0
>>    GigabitEthernet0/1       0     0    0     0     0    0     0    0    0
>> * Serial0/0/0              0     0    0     0  3000    3  2000    2    0
>>    NVI0                     0     0    0     0     0    0     0    0    0
>> * Tunnel0                  0     0    0     0     0    0     0    0    0
>> * Tunnel1                  0     0    0    10  1000    2  1000    2    0
>> * Tunnel2                  0     0    0     0     0    0     0    0    0
>> * Tunnel3                  0     0    0     0     0    0     0    0    0
>>
>> I thought may be something got left behind while I was monkeying
>> around in it so I reloaded the router and the tunnel 0,2,3 are still
>> there and it says it's up.   None of those interfaces are in the
>> startup or running-config.
>>
>> What is going on here?  My other routers with similar config on a 1841
>> with 12.4(15)T* doesn't have this issue.  It doesn't seem to be
>> affecting the routing of traffic but it's really bothering me.
>>
>> -Jay
>>      
> I have seen similar on ASRs.  From memory I think there were some of the
> mystery tunnels and then quite a few more after enabling multicast..
> Would be great to see an explaination though.
>
> Cheers
>
> Ivan
>
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