[c-nsp] PPPoE termination on ES+20/12.2(33)SRE1

[Walter Keen]

I'm trying to terminate 802.1q tagged PPPoE sessions on a 7600 with a 
ES+20G card.  PPPoE works fine, but large packets (ie: 1500 bytes) 
fail.  All MTU's are 9216 throughout the path until it hits the ES+20 card.

I did some initial work with this as a test on a 7200, hit the same 
problem, and the resolution was the use of ip tcp adjust-mss, however 
that does not seem to be working here.  I've tried it under gi2/1 as 
well, with no luck.  Doesn't seem to be an option under 'bba-group' for it

Of course adjusting the mtu on the client pc to something small, like 
1400 resolves it, but I'm looking at a mass migration of dsl customers, 
so that's not a feasible solution.

Has anyone run into this, before I open a tac case on it?



bba-group pppoe TEST-BBA
  virtual-template 1
  vendor-tag circuit-id service
  vendor-tag remote-id service
  vendor-tag dsl-sync-rate service
  mac-address autoselect
  sessions auto cleanup
!
interface GigabitEthernet2/1
  mtu 9216
  no ip address
  speed 1000
!
interface GigabitEthernet2/1.460 access
  description Tnwx-E5111-001
  encapsulation dot1Q 460
  ip tcp adjust-mss 1400
  pppoe enable group TEST-BBA
  ip subscriber l2-connected
   initiator unclassified mac-address
!
!
interface Virtual-Template1
  ip unnumbered Loopback0
  no ip proxy-arp
  peer default ip address pool BRAS-DSL
  ppp authentication chap
!
!
interface Loopback0
  ip address xx.xx.xx.1 255.255.255.0
!
---



-- 
Walter Keen