Troubleshooting guide

ManualsBrandsCisco ManualsComputer equipment827 - 827 Router - EN

24 maximum active VCs, 256 VCS per VP, 1 current VCCs

VC idle disconnect time: 300 seconds

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/40, 0 drops; input queue 0/75, 0 drops

5 minute input rate 5 bits/sec, 0 packets/sec

5 minute output rate 7 bits/sec, 0 packets/sec

100 packets input, 5600 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

250 packets output, 1400 bytes, 0 underruns

0 output errors, 0 collisions, 2 interface resets

0 output buffer failures, 0 output buffers swapped out

If the input packet counters are incrementing, you should be receiving PPPoE negotiation packets from your

ISP. If this isn't the case, call your ISP.

If the output bound counters are incrementing, you should be sending PPPoE negotiation packets. If this isn't

the case, check the configuration on the router. If PPP is configured properly, PPP negotiation packets are

continually sent out the ATM0 interface.

If packets are incrementing in only the outbound direction, continue with the troubleshooting steps in this

document.

Is a PPPoE session up?

PPPoE is executed in two phases. The first phase is PPPoE session establishment, and the second phase is the

PPP negotiation. PPPoE must be established prior to the negotiation of standard PPP parameters. The easiest

way to determine if you have an active PPPoE session is to issue the show vpdn command.

Router#show vpdn

%No active L2TP tunnels

%No active L2F tunnels

%No active PPTP tunnels

PPPoE Tunnel and Session Information Total tunnels 1 sessions 1

PPPoE Tunnel Information

Session count: 1

PPPoE Session Information

SID RemMAC LocMAC Intf Vast OIntf VP/VC

0 0000.0000.0000 0000.0000.0000 UNKN ATM0 8/35

In the example above, no PPPoE sessions are active. This is indicated by an SID of 0, and the RemMAC and

LocMAC of 0000.0000.0000. If you are in this state, proceed to the next section.

A PPPoE session that has been successfully negotiated looks like the following: