[c-nsp] 1841/Loopback/ADSL issue

[Erik Soosalu]

Wondering if I could ask you all for a quick comment on my issue before
I try an open a TAC case on this.

 

Situation is a 1841 router with WIC-1ADSL terminating a PPPoE and T1
LANe circuit (which is delivered to me over Ethernet).  I have a
loopback interface on the router that is used both for connecting
monitoring and as an un-numbered interface for the PPPoE.  My issue is
that when the PPPoE flaps, I temporarily lose connection to the loopback
on the router.  I have verified that as it flaps, there is no change in
OSPF routing and the LANe is still the preferred route.

 

Relevant portions of the config:

interface Loopback10

 ip address 10.1.255.15 255.255.255.255

!

interface FastEthernet0/1

 description LANe

 ip address 10.1.254.30 255.255.255.248

!

interface ATM0/0/0

 pvc 0/35 

  pppoe-client dial-pool-number 1

!

interface Dialer1

 ip unnumbered Loopback10

 dialer pool 1

 

This router has exhibited this issue with at least three different
versions of IOS.

 

As the PPPoE flaps, if I'm connected to the internal network interface
of the router, I'm good.  Connect to the loopback, I lose connection.  I
know I could simply setup another loopback for management purposes, but
I thought that the loopback was always supposed to stay up.

 

Any tweaks anyone can think of, or should I open a TAC case?  

 

Thanks,

Erik