[c-nsp] Balancing T1's with CEF

[Rodney Dunn]

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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