[c-nsp] PPP Multilink failed on multihop

[Jefri Abdullah]

On 5/30/07, Doug Clements <dclements at gmail.com> wrote:

> Well, I'm no expert, but signs point to either no route out from your
> gateway, or no return path back to the source of the ping from hosts beyond
> your gateway. Is your return path learned on upstream routers as well? Can
> you verify the return path from these routers?

[152.118.24.1] ---- [7609] ----PPP Multilink----[7606]

>From 152.118.24.1:

BGP-AS3382# sh ip bgp 167.205.189.38
BGP routing table entry for 167.205.128.0/17
Paths: (1 available, best #1, table Default-IP-Routing-Table)
  Not advertised to any peer
  65002 65003
    152.118.255.250 from 152.118.255.250 (167.205.190.2)
      Origin IGP, localpref 100, weight 50000, valid, external, best
      Last update: Wed May 30 02:34:45 2007

>From 7609:

7609#sh ip bgp 152.118.24.1
BGP routing table entry for 152.118.0.0/16, version 3
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Multipath: eBGP
  Advertised to update-groups:
     1
  3382
    152.118.255.249 from 152.118.255.249 (152.118.255.254)
      Origin IGP, metric 100, localpref 100, valid, external, best

7609#sh ip route a.b.c.39
Routing entry for a.b.c.39/32
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Routing Descriptor Blocks:
  * directly connected, via Multilink1
      Route metric is 0, traffic share count is 1


>From 7606:

7606#sh ip route 152.118.24.1
Routing entry for 152.118.24.1/32
  Known via "static", distance 1, metric 0
  Routing Descriptor Blocks:
  * 167.205.189.38
      Route metric is 0, traffic share count is 1

IBRUNTIRTA01#sh ip route a.b.c.38
Routing entry for a.b.c.38/32
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Routing Descriptor Blocks:
  * directly connected, via Multilink1
      Route metric is 0, traffic share count is 1

I'm sure there is no routing problem in my router, FYI, if I attached
address a.b.c.38 and a.b.c.39 on serial interface directly, packet can
flow normally. This is my ping result when I'm not using PPP
Multilink.

7606#sh ip route a.b.c.38
Routing entry for a.b.c.38/31
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Advertised by bgp 65008
  Routing Descriptor Blocks:
  * directly connected, via Serial3/1/1
      Route metric is 0, traffic share count is 1

7606#ping 152.118.24.1

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 152.118.24.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/8 ms



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