[c-nsp] Balancing T1's with CEF

[Security Team]

Hi Rodney:


I get errors on the commands:

#config t     
Enter configuration commands, one per line.  End with CNTL/Z.
(config)#ip cef account load per pre hash
                                     ^
% Invalid input detected at '^' marker.

(config)#ip cef account load per prehash
                                    ^
% Invalid input detected at '^' marker.



It DID take this one OK though:

(config)#ip cef account load per pre

#show ip cef x.y.z.0 internal
X.y.z.0/24, version 2739, epoch 0, attached, per-destination sharing
0 packets, 0 bytes
  via Serial1/1/0, 0 dependencies
    traffic share 1
    valid adjacency (0x43E8C140)
  via Serial1/1/3, 0 dependencies
    traffic share 1
    valid adjacency (0x43E8C440)
  via Serial1/0/0/12:0, 0 dependencies
    traffic share 1
    valid adjacency (0x43E8B9C0)

  0 packets, 0 bytes switched through the prefix
  tmstats: external 0 packets, 0 bytes
           internal 0 packets, 0 bytes
  Load distribution: 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 (refcount 1)

  Hash  OK  Interface                 Address         Packets
  1     Y   Serial1/1/0               point2point           0
  2     Y   Serial1/1/3               point2point           0
  3     Y   Serial1/0/0/12:0          point2point           0
  4     Y   Serial1/1/0               point2point           0
  5     Y   Serial1/1/3               point2point           0
  6     Y   Serial1/0/0/12:0          point2point           0
  7     Y   Serial1/1/0               point2point           0
  8     Y   Serial1/1/3               point2point           0
  9     Y   Serial1/0/0/12:0          point2point           0
  10    Y   Serial1/1/0               point2point           0
  11    Y   Serial1/1/3               point2point           0
  12    Y   Serial1/0/0/12:0          point2point           0
  13    Y   Serial1/1/0               point2point           0
  14    Y   Serial1/1/3               point2point           0
  15    Y   Serial1/0/0/12:0          point2point           0

I'll send the rest of the stuff off list if that's OK, it's huge anyway.

I should mention that at this point the traffic to their site is really low
so I can't tell if it is happening right now.

Thanks,
CJ



On 7/30/09 5:50 AM, "Rodney Dunn" <rodunn at cisco.com> wrote:

> Turn on:
> 
> config t
> ip cef account load per pre hash
> 
> Just type it..it's hidden.
> 
> And then get "sh ip cef <dstprefix> internal" and send.
> 
> Then get 'sh cef int' and send.
> 
> Also a couple snapshots of 'sh int stat' after a "clear counters"..
> 
> Rodney
> 
> 
> 
> Security Team wrote:
>> I rebooted a 7507 router that had a site connected with 3 T1's and now all
>> the traffic is nailing one line instead of being distributed over all 3
>> using the static routes/CEF.
>> 
>> I did look at the Cisco troubleshooting tips but didn't see anything
>> immensely helpful.  Here is a config snippet on the 7507 side (it's
>> obviously nothing
>> whizzy).
>> 
>> Has anyone seen this before?  I did an ip clear cache and also tried doing a
>> shut/no shut on each line individually on the 7507, but the traffic to the
>> customer's
>> 28xx router always sacks one line.  It seems like in the past I did some
>> kind of clear on the 7507 and things got better, but I can't recall what
>> that may have been.
>> 
>> Thanks,
>> CJ
>> 
>> 7507 (all PA adapters on the same VIP) config. One T1 comes in on a chan DS3
>> card breaking out individual T1¹s, and the other 2 T1¹s come in on a 4-port
>> PA adapter T1 card. I¹m not using dCEF since I have never had good luck with
>> it.
>> 
>> ip cef
>> !
>> interface Serial1/0/0/12:0
>>  bandwidth 1536
>>  ip address x.x.x.x y.y.y.y
>>  load-interval 30
>>  no fair-queue
>>  down-when-looped
>>  no cdp enable
>> !
>> interface Serial1/1/0
>>  bandwidth 1536
>>  ip address x.x.x.x y.y.y.y
>>  load-interval 30
>>  no fair-queue
>>  down-when-looped
>>  no cdp enable
>> !
>> interface Serial1/1/3
>>  bandwidth 1536
>>  ip address x.x.x.x y.y.y.y
>>  load-interval 30
>>  no fair-queue
>>  down-when-looped
>>  no cdp enable
>> 
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