[c-nsp] PPP Mulitilink on 3620

[David Simmons - EliteUKServe.Net]

Thanks for this.

I saw this. Can you clarify to me then what my maximum PPS for this router 
would be utilising the multilink¿ 2k?

#sh int | i packets/sec  
  5 minute input rate 2027000 bits/sec, 360 packets/sec
  5 minute output rate 1989000 bits/sec, 620 packets/sec
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  5 minute input rate 514000 bits/sec, 370 packets/sec
  5 minute output rate 531000 bits/sec, 286 packets/sec
  5 minute input rate 514000 bits/sec, 368 packets/sec
  5 minute output rate 529000 bits/sec, 286 packets/sec
  5 minute input rate 515000 bits/sec, 368 packets/sec
  5 minute output rate 527000 bits/sec, 287 packets/sec
  5 minute input rate 514000 bits/sec, 370 packets/sec
  5 minute output rate 526000 bits/sec, 285 packets/sec
  5 minute input rate 2003000 bits/sec, 768 packets/sec
  5 minute output rate 2029000 bits/sec, 504 packets/sec

currently 2MBish going through it.

Kind Regards,

David Simmons

On Tuesday 22 February 2005 16:00, Josh Duffek wrote:
> Does kinda sound like you are pushing too much through it...not sure
> though.  Look at the "sh proc cpu" and also look at the IP INPUT
> process.  Might also look at "sh int | i packets/sec" and see where that
> is...found this post:
>
> https://puck.nether.net/pipermail/cisco-nsp/2004-November/014214.html
>
> "3620 can do 2,000pps process switched and 20,000-40,000 in CEF
> depending
> on the alignment of the stars."
>
> Thanks,
>
> josh duffek    network engineer
> consultantjd16 at ridemetro.org
>
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> > bounces at puck.nether.net] On Behalf Of David Simmons - EliteUKServe.Net
> > Sent: Tuesday, February 22, 2005 9:44 AM
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] PPP Mulitilink on 3620
> >
> > Hi,
> >
> > We have a link for a service provider and they insisted on shoving in
>
> a
>
> > fibre
> > to our building then splitting the fibre into 4 x 2mb tribs. Then from
> > there
> > we have 4 x X25 into a 3620 with a NM-4T. Now our other providers give
>
> us
>
> > LES
> > circuits etc.. We run BGP.
> >
> > It has all worked fine untill the traffic started rising to say nearly
>
> 4MB
>
> > on
> > this line. Then the CPU usage goes bananas on this router. Packets
>
> start
>
> > being lost and we get very high ping times. All this router does is
>
> the
>
> > PPP
> > multilink and is then directly connect to a 7200 ... which handles the
>
> BGP
>
> > etc.
> >
> > My question is ... and I will admit to not being extremely cisco
> > knowledgable
> > (this was dumped on my desk) ... is is this simply a matter of the
>
> router
>
> > not
> > being able to handle whats chucked at it ... or could there be things
>
> we
>
> > are
> > doing or not doing right with the multilink?
> >
> > Hoping you may have some ideas.
> >
> > Regards,
> >
> > David SImmons
> >
> > interface Multilink1
> >  description ### Multilink (4 Serials) ###
> >  bandwidth 8192
> >  ip address xx.xx.xx.xx 255.255.255.252
> >  ip access-group 151 in
> >  ip access-group 101 out
> >  ppp multilink
> >  multilink-group 1
> >
> > [cut]
> >
> > interface Serial1/0
> >  description ### Trib 1 ###
> >  bandwidth 2048
> >  no ip address
> >  no ip proxy-arp
> >  encapsulation ppp
> >  no ip mroute-cache
> >  serial restart-delay 0
> >  ppp multilink
> >  multilink-group 1
> > !
> > interface Serial1/1
> >  description ### Trib 2 ###
> >  bandwidth 2048
> >  no ip address
> >  no ip proxy-arp
> >  encapsulation ppp
> >  no ip mroute-cache
> >  serial restart-delay 0
> >  ppp multilink
> >  multilink-group 1
> > !
> > interface Serial1/2
> >  description ### Trib 3 ###
> >  bandwidth 2048
> >  no ip address
> >  no ip proxy-arp
> >  encapsulation ppp
> >  no ip mroute-cache
> >  serial restart-delay 0
> >  ppp multilink
> >  multilink-group 1
> > !
> > interface Serial1/3
> >  description ### Trib 4 ###
> >  bandwidth 2048
> >  no ip address
> >  no ip proxy-arp
> >  encapsulation ppp
> >  no ip mroute-cache
> >  serial restart-delay 0
> >  ppp multilink
> >  multilink-group 1
> >
> > [cut]
> >
> > ip classless
> > ip route 0.0.0.0 0.0.0.0 Multilink1
> > ip route xx.xx.xx.0 255.255.240.0 xx.xx.xx.26
> > ip route xx.xx.xx.1 255.255.255.255 xx.xx.xx.26
> >
> > _______________________________________________
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