Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
New Member

Serial Line Issue

I have a circuit that I am able to ping with pattern of 0's just fine, but when I ping with 1's I get about 95% packetloss. I have seen an issue with optioning problems on a DS1 when there was a B8ZS/AMI mismatch, but in that case I couldn't ping with 0's but could with 1's. The symptoms are the same for the enduser which is trouble with anything that is compressed data, i.e., jpgs, zip files..and the like...text transfer is fine...any help would be appreacitated. The connection comes of a cisco 7206, I have other connections that are fine with both types of pings...

here is what I see

$ ping -p 1 x.x.59.77

PATTERN: 0x01

PING x.x.59.77 (x.x.59.77) from 10.25.254.230 : 56(84) bytes of data.

--- x.x.59.77 ping statistics ---

19 packets transmitted, 0 received, 100% loss, time 18016ms

$ ping -p 0 x.x.59.77

PATTERN: 0x00

PING x.x.59.77 (x.x.59.77) from 10.25.254.230 : 56(84) bytes of data.

64 bytes from x.x.59.77: icmp_seq=1 ttl=60 time=8.24 ms

64 bytes from x.x.59.77: icmp_seq=2 ttl=60 time=8.02 ms

64 bytes from x.x.59.77: icmp_seq=3 ttl=60 time=7.84 ms

64 bytes from x.x.59.77: icmp_seq=4 ttl=60 time=7.94 ms

--- x.x.59.77 ping statistics ---

4 packets transmitted, 4 received, 0% loss, time 3030ms

rtt min/avg/max/mdev = 7.845/8.016/8.245/0.183 ms

also getting wierd ping responses with packet size of 1500

$ ping x.x.59.77 -s 1500

PING x.x.59.77 (x.x.59.77) from 10.25.254.230 : 1500(1528) bytes of data.

1480 bytes from x.x.59.77: icmp_seq=1 ttl=60 (truncated)

1480 bytes from x.x.59.77: icmp_seq=2 ttl=60 (truncated)

1480 bytes from x.x.59.77: icmp_seq=3 ttl=60 (truncated)

1480 bytes from x.x.59.77: icmp_seq=4 ttl=60 (truncated)

1480 bytes from x.x.59.77: icmp_seq=5 ttl=60 (truncated)

1480 bytes from x.x.59.77: icmp_seq=6 ttl=60 (truncated)

--- x.x.59.77 ping statistics ---

6 packets transmitted, 6 received, 0% loss, time 5043ms

rtt min/avg/max/mdev = 70.072/70.180/70.276/0.166 ms

1 REPLY
Hall of Fame Super Silver

Re: Serial Line Issue

Thomas

I do not think that we have enough information here to really diagnose the specific cause of the problem. But with the results you are getting to ping with specific payload patterns there is surely evidence of problems on that link. I would think that you should open a ticket with whoever provides that link and request that they test and find the problem (which is probably a mismatch somewhere).

HTH

Rick

161
Views
0
Helpful
1
Replies
CreatePlease to create content