[c-nsp] MLPPP

[Jason Berenson]

Rodney,

It's running: 12.4(18a).  I had to downgrade from the latest about 6 
months ago because of a bug where 'show policy' would show no output 
even if QoS was working properly.

router#show int mul2 stat
Multilink2
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0          0          0
             Route cache      18049    3982931      25553   14234069
                   Total      18049    3982931      25553   14234069
router#show int mul2 stat
Multilink2
          Switching path    Pkts In   Chars In   Pkts Out  Chars Out
               Processor          0          0          0          0
             Route cache      18601    4110973      26553   14682852
                   Total      18601    4110973      26553   14682852

fonseca#show cef in mul 2
Multilink2 is up (if_number 132)
  Corresponding hwidb fast_if_number 132
  Corresponding hwidb firstsw->if_number 132
  Internet address is 10.3.4.229/30
  ICMP redirects are always sent
  Per packet load-sharing is disabled
  IP unicast RPF check is disabled
  Inbound access list is not set
  Outbound access list is not set
  Interface is marked as point to point interface
  Hardware idb is Multilink2
  Fast switching type 7, interface type 105
  IP CEF switching enabled
  IP CEF VPN Feature Fast switching turbo vector
  IP Null turbo vector
  VPN Forwarding table "nypirg"
  Input fast flags 0x1000, Input fast flags2 0x0, Output fast flags 
0x4000, Output fast flags2 0x0
  ifindex 127(127)
  Slot -1 Slot unit 2 Unit 2 VC -1
  Transmit limit accumulator 0x0 (0x0)
  IP MTU 1500

Does that mean that there's no processor switching going on there?  Why 
would a VRF make any difference to the MLPPP?  I see the same outputs 
for a non VRF'd MLPPP.

-Jason

Rodney Dunn wrote:
> You have it in a VRF which really shouldn't cause an issue as it's
> tag2ip and ip2tag.
>
> What code is it?
>
> Make sure it's the latest 12.4 mainline as we did some work in 12.4 to make
> this work.
>
> Can you get a 'sh int mul 2 stat' after a clear counters...get it a few
> times and send it?
>
> Also, what are the other interface configs feeding this bundle?
> It could be features on them causing the punts.
>
> What does 'sh cef int' say?
>
>
> Rodney
>
> On Wed, Mar 25, 2009 at 05:03:03PM -0400, Jason Berenson wrote:
>   
>> Here's a sample:
>>
>> interface Multilink2
>> ip vrf forwarding VPN1
>> ip address x.x.x.x 255.255.255.252
>> no cdp enable
>> ppp multilink
>> ppp multilink group 2
>> service-policy output voice
>> !
>> interface Serial6/0/25:0
>> no ip address
>> encapsulation ppp
>> down-when-looped
>> no cdp enable
>> ppp multilink
>> ppp multilink group 2
>> !
>> interface Serial6/0/26:0
>> no ip address
>> encapsulation ppp
>> down-when-looped
>> no cdp enable
>> ppp multilink
>> ppp multilink group 2
>> !
>>
>> -Jason
>>
>>
>> Rodney Dunn wrote:
>>     
>>> The G1's with MLPPP should not be process switching the traffic.
>>>
>>> What is the config?
>>>
>>> The EC cards just offload the MLPPP to the new asic on the PA.
>>>
>>> Rodney
>>>
>>> On Wed, Mar 25, 2009 at 04:35:50PM -0400, Jason Berenson wrote:
>>>  
>>>       
>>>> Greetings,
>>>>
>>>> I've got a 7206VXR NPE-G1 with a bunch of DS3 cards in it (PA-MC-T3).  
>>>> There's about 25 multilinks with an average of 2 T1s per bundle.  I see 
>>>> a lot of process switching on the router and I have a feeling it's 
>>>> because we don't have the PA-MC-T3-EC card so the processor has to step 
>>>> in for the MLPPP. 
>>>>
>>>> Is this the case?  If I get some PA-MC-T3-EC cards to swap in, will that 
>>>> take a lot of load off the NPE-G1?  Any output needed, please let me know.
>>>>
>>>> Thanks,
>>>> Jason
>>>> _______________________________________________
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>>>>    
>>>>