[c-nsp] MPLS multilink MTU

[Soon Kian]

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