[c-nsp] Fw: MTU problem on Virtual-Access interfaces

[MADMAN]

   Look at CSCdt91142

  Dave

Gyebnár Krisztián wrote:

> Hi all,
> 
> We have a litle problem with our NPE-G1, We use this router to terminate cca 3000 L2TP sessions and PPPoE.
> Some days ago, many customer have a problem with VPN, browsing, etc...We try to find the problem what's wrong. We check the customer, also some CPE router config..., but we found interesting things in our Termination router: The Virtual-access interface MTU is BIGGER than than his mother(Virtual-Template 1) MTU !!!
> 
> If I clear manualy the Vi intarface; next time when the Router come up the interface will be ok with MTU of 1492...
> and some time later the interface go wrong and will be again MTU of 1512 :-( 
> I dont know how this is possible, because of the config is very simple without any fancy feature and works fine couple of times...
> 
> Any idea ???
> 
> 
> THX 
> 
> gyebi
> 
> Virtual-Access61 is up, line protocol is up
>   Hardware is Virtual Access interface
>   Interface is unnumbered. Using address of GigabitEthernet0/1 (195.228.xx.yy)
>   MTU 1512 bytes, BW 3735 Kbit, DLY 100000 usec,
>      reliability 255/255, txload 1/255, rxload 1/255
>   Encapsulation PPP, LCP Open, multilink Closed
>   Open: IPCP
>   PPPoVPDN vaccess, cloned from Virtual-Template1
>   Vaccess status 0x44
> .......
> 
> interface Virtual-Template1
>  mtu 1492
>  ip unnumbered GigabitEthernet0/1
>  no ip unreachables
>  no logging event link-status
>  peer default ip address pool adsl1
>  keepalive 30
>  ppp authentication pap
>  ppp multilink
>  no clns route-cache
> 
> !
> vpdn-group adsl
> ! Default L2TP VPDN group
> ! Default PPTP VPDN group
>  accept-dialin
>   protocol any
>   virtual-template 1
>  local name XXX
>  lcp renegotiation on-mismatch
> !
> 
> System image file is "c7200-jk9o3s-mz.123-10a.bin"
> 
> 
> 
> 
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-- 
David Madland
CCIE# 2016
Sr. Network Engineer
Qwest Communications
612-664-3367

"Emotion should reflect reason not guide it"