44
Physical is MP
Output queue : (Urgent queue : Size/Length/Discards) 0/500/0
Output queue : (FIFO queuing : Size/Length/Discards) 0/75/0
5 minutes input rate 0 bytes/sec, 0 packets/sec
5 minutes output rate 0 bytes/sec, 0 packets/sec
5 packets input, 58 bytes, 0 drops
5 packets output, 54 bytes, 0 drops
# Ping the IP address 111.1.1.2 on Router A.
[RouterA] ping 111.1.1.2
PING 111.1.1.2: 56 data bytes, press CTRL_C to break
Reply from 111.1.1.2: bytes=56 Sequence=1 ttl=255 time=29 ms
Reply from 111.1.1.2: bytes=56 Sequence=2 ttl=255 time=31 ms
Reply from 111.1.1.2: bytes=56 Sequence=3 ttl=255 time=29 ms
Reply from 111.1.1.2: bytes=56 Sequence=4 ttl=255 time=30 ms
Reply from 111.1.1.2: bytes=56 Sequence=5 ttl=255 time=30 ms
--- 111.1.1.2 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 29/29/31 ms
In this approach, all the users are bound together to the MP-group interface and the concept of
virtual access is not involved.
Troubleshooting PPP configuration
Symptom 1
PPP authentication always fails, preventing the link from going up.
Solution
This problem might occur if the parameters for authentication are incorrect.
• Enable the debugging of PPP, and you can see the information describing that LCP went up
upon a successful LCP negotiation but went down after PAP or CHAP negotiation.
• Check the PPP authentication settings at the local and peer ends to make sure that they are
consistent. See "Configuring PAP authentication" and
"Configuring CHAP authentication" for
reference.
Symptom 2
Physical link is always down.
Solution
Check the following:
• The interface has been brought up.
• The interface has not been administratively shut down.
• LCP negotiation has passed.
Execute the display interface serial command to check the state of the interface. The output can be
as follows:
•
serial number is administratively down, line protocol is down—Indicates that the
interface is shut down by the administrator.
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