[c-nsp] MPLS multilink MTU

[Rodney Dunn]

Soon,

I haven't done this myself but I've seen discussions around
it before. From what I remember it has to do with the
MRRU negotiated values.

Check 'debug ppp negotiation' and let's see what
we negotiated for MRU.

Also, it's best not to use the "mpls mtu" command anymore
and always set the phsyical MTU on the interface to
account for the MPLS and/or tunnel overhead.

CSCdj40945 
PPP multilink MRRU value is not configurable

added the support for the:

[no] ppp multilink mrru remote [num]
and
[no] ppp multilink mrru local [num]

commands.

See if that helps and let me know.

Rodney




On Wed, Jul 30, 2008 at 10:51:30AM +0800, Soon Kian wrote:
> Hi Guys,
> 
> Wondering if any one met with such problem before ?
> 
> a. Setup: MPLS PE - MPLS PE (using 2 x E1 with mlppp multilink)
> b. If only 1 x E1 is in bundle, I could ping vrf up to 1500 df. However when
> both E1 are in the multilink, I only could ping up to 1496
> c. IOS: c7200-jk9s-mz.124-18.bin
> d. E1 Controller: PA-MC-8E1/120
> 
> Configuration:
> 
> interface Multilink11
>  ip address x.x.x.x
>  no ip redirects
>  no ip proxy-arp
>  carrier-delay 10
>  mpls label protocol ldp
>  mpls ip
>  mpls mtu 1600
>  no cdp enable
>  ppp multilink
>  ppp multilink group 11
>  no clns route-cache
> 
> interface Serial1/7:0
>  bandwidth 2048
>  ip address x.x.x.x 255.255.255.252
>  encapsulation ppp
>  ppp multilink
>  ppp multilink group 11
>  no clns route-cache
> 
> interface Serial2/5:0
> bandwidth 2048
>  ip address x.x.x.x 255.255.255.252
>  encapsulation ppp
>  no fair-queue
>  ppp multilink
>  ppp multilink group 11
>  no clns route-cache
> 
> router>sh ppp multilink
> Bundle up for 19:47:41, total bandwidth 4096, load 42/255
>   Receive buffer limit 24000 bytes, frag timeout 1000 ms
>     0/0 fragments/bytes in reassembly list
>     37 lost fragments, 122838 reordered
>     632/475896 discarded fragments/bytes, 0 lost received
>     0x203DB4 received sequence, 0x16EF7F sent sequence
>   Member links: 2 active, 0 inactive (max not set, min not set)
>     Se2/5:0, since 19:47:52
>     Se1/7:0, since 19:47:49
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