[c-nsp] Balancing T1's with CEF

[Matthew Huff]

Unless you do "per-packet" load-sharing (which you don't want to do since
it's cpu switched), the path is session based. If most of the traffic is
going from one source to one destination, it won't be load-shared. What do
the routing tables look like in both directions?

----
Matthew Huff       | One Manhattanville Rd
OTA Management LLC | Purchase, NY 10577
http://www.ox.com  | Phone: 914-460-4039
aim: matthewbhuff  | Fax:   914-460-4139


> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Security Team
> Sent: Wednesday, July 29, 2009 11:24 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] Balancing T1's with CEF
> 
> 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
> 
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 4229 bytes
Desc: not available
URL: <https://puck.nether.net/pipermail/cisco-nsp/attachments/20090730/b3f9ecc9/attachment-0001.bin>