10-08-2008 07:31 AM - edited 03-03-2019 11:50 PM
We currently have two customers both with Cisco 2651XM's configured with a standard ATM WIC card and ISDN BRI card. Both are connected to BT Wholesale provided IPStream MAX Premium DSL services. Both sites are running "c2600-advsecurityk9-mz.123-8.T3" as their IOS. The routers are both configured with PPP and Virtual Access 2 is currently up/down. The strange part comes when I do "sh dsl int ATM0/0". On the downstream the router reports the DSL using interleaving and on the upstream using fastpath. As far as I'm aware this is impossible but BTWS are saying the circuits are configured correctly and they can see no problems. Both circuits have also been rebuilt. Has anyone come across this issue before or know how to resolve it?
10-08-2008 01:21 PM
Hello Rob,
with DMT modulation different tones are used for upstream and downstream so this should be possible in theory.
try the following
term mon
debug ppp neg
debug ppp auth
int atm0/0
shut
no shut
and see if PPP negotiation starts if there is an exchange of frames
If you like you can post it here in a file
Hope to help
Giuseppe
10-15-2008 08:42 AM
10-15-2008 10:19 AM
Hello Rob,
there are only LCP packets sent by your router the O means tx I means rx. No LCP frame is received.
So or the encapsulation to be used is different : PPPoEoA instead of PPPoA or viceversa (so it was in another thread) or there is no PPP service on the link ( it is a line with classical IPv4 over ATM using aal5snap) or actually there is a L1 problem.
try to see the counters on the sh dsl interface check for total cells tx and rx and errors.
If statistics show a low error rate ask the provider what encapsulation they expect on the link
else ask the provider to verify the line.
Hope to help
Giuseppe
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