03-16-2009 05:13 AM - edited 03-04-2019 03:57 AM
We have some spoke sites connected to HUB location. All the sites are having 2 E1 links which are bundled via Multilink. The issue is when we pump traffic on it the CRC and errors on both the links at spoke site increases and when we unbundled the links it works fine. Also when we ping even with heavy size packet there is no drop, no crc and no errors increases. Also the provider as given the clean chit.
What could be the issue. I have attached the config file.
03-16-2009 08:35 AM
Hello Vishal,
you can use
sh ppp multilink
and
sh int ser0/0/0:0
sh int ser0/0/1:0
to verify if there are errors related to multilink ppp
you have set
ppp multilink fragment delay 8
this implies a dimension of ppp fragments sent on member links
default value is 30 msecs you have set to 8 msecs
see
http://www.cisco.com/en/US/docs/ios/dial/command/reference/dia_p2.html#wp1013182
you may have set this for VOIP
to perform a test bypassing fragmentation use
ppp multilink fragment disable
in this way you can see if the issue is related to fragmentation.
you may consider to use the two links as separated parallel L3 links.
Hope to help
Giuseppe
03-17-2009 04:23 AM
Thanks giuslar, for the reply
I tried disabling fragmentation at multilink but that did not helped.
I checked that errors are increasing at serial interfaces not on the multilink.
03-17-2009 04:27 AM
Hello Vishal,
in this case you should have problems also when using them as standalone links.
Verify with the WAN provider the state of the links
Hope to help
Giuseppe
03-17-2009 04:38 AM
Hi giuslar
Our provider has already changed their ring for us and also the mux. We have also changed the module on our router side.
can there be any clocking issue. or something else.
we are having similar issue on all the sites having same set-up.
04-01-2009 11:01 PM
Hi giuslar
Thanks for your kind support. I dont know how but upgrading the IOS helped us in resolving the issue
04-02-2009 11:58 AM
Yea, it can be a clocking issue. I've run into this before when using dual port VWIC cards. In my case it was a matter of setting the first ports clock source to line, and the second port to internal. Just co-ordinate this with your carrier so that everything matches up.
I use MLPPP at all of my sites... Your configuration should look something like this.
!
controller T1 0/0
framing esf
clock source internal
linecode b8zs
channel-group 0 timeslots 1-24 speed 64
description Link1 of Sprint Dual T1
!
controller T1 0/1
framing esf
linecode b8zs
channel-group 0 timeslots 1-24 speed 64
description Link2 of Sprint Dual T1
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: