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Help needed Cisco 3660

UN-FALD
Level 1
Level 1

Greetings Cisco Experts,

I’m trying to connect two Cisco 3660 back-back using VWIC-2MFT-E1 (RJ 48 cross over)

Cisco 3660(VWIC-2MFT-E1)=====(VWIC-2MFT-E1)Cisco3660

One of the VWIC-2MFT-E1 is in the 2W slot and the other is in the 2FE-2W slot

But for some reasons both of them are not talking to each other and I’m getting

A lot of slip alarms on the controllers

Following is the simple config of both routers

Router 1

controller E1 5/0

shutdown

framing NO-CRC4

clock source free-running

!

controller E1 5/1

framing NO-CRC4

clock source internal

channel-group 1 timeslots 1-31

!

!

interface FastEthernet0/0

no ip address

shutdown

duplex auto

speed auto

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial4/0

no ip address

shutdown

!

interface Serial4/1

no ip address

shutdown

!

interface Serial4/2

no ip address

shutdown

!

interface Serial4/3

no ip address

shutdown

!

interface FastEthernet5/0

no ip address

shutdown

duplex auto

speed auto

!

interface FastEthernet5/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial5/1:1

ip address 10.160.63.22 255.255.255.252

!

router eigrp 1

network 10.160.63.20 0.0.0.3

auto-summary

no eigrp log-neighbor-changes

!

E1 5/1 is up.

Applique type is Channelized E1 - balanced

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20000922, FPGA: 15

Framing is NO-CRC4, Line Code is HDB3, Clock Source is Internal.

Current port master clock: local osc on this network module

Data in current interval (191 seconds elapsed):

0 Line Code Violations, 0 Path Code Violations

191 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

191 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Router 2 Config

controller E1 5/1

framing NO-CRC4

channel-group 1 timeslots 1-31

!

!

interface FastEthernet0/0

no ip address

shutdown

duplex auto

speed auto

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

!

interface Serial2/0

no ip address

shutdown

clockrate 2015232

!

interface Serial2/1

no ip address

shutdown

!

interface Serial2/2

no ip address

shutdown

!

interface Serial2/3

no ip address

shutdown

!

interface Serial5/1:1

ip address 10.160.63.21 255.255.255.252

!

router eigrp 1

network 10.160.63.20 0.0.0.3

auto-summary

no eigrp log-neighbor-changes

E1 5/1 is up.

Applique type is Channelized E1 - balanced

No alarms detected.

alarm-trigger is not set

Version info Firmware: 20000922, FPGA: 15

Framing is NO-CRC4, Line Code is HDB3, Clock Source is Line.

Current port master clock: recovered from controller 5/1

Data in current interval (868 seconds elapsed):

1 Line Code Violations, 0 Path Code Violations

0 Slip Secs, 0 Fr Loss Secs, 1 Line Err Secs, 0 Degraded Mins

1 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

Thanks in Advance

aht

3 Replies 3

thisisshanky
Level 11
Level 11

For the VWICs I think you need to configure the channel group command with the speed option specified as follows.

channel-group 1 timeslots 1-31 speed 64

This will use each DS0 channel at 64K. Default value is 56Kbps if you do not specify the speed option.

Hope that helps!

Sankar Nair
UC Solutions Architect
Pacific Northwest | CDW
CCIE Collaboration #17135 Emeritus

thisisshanky,

Thank you very much for the quick reply

Yes I already configured that as 64 but still didn't work.

In one of the manual I found that VWIC-2MFT-E1 has

built in DSU but not CSU,so I'm not sure whether

can I connect them back to back,or should I connect to it a third party CSU to give clocking to it.

Any ideas will be highly appreciated

aht

Hi,

By default for E1 channel speed is 64k, so that is not the problem.

I think u will have to change the clocking for one side to clock source line and the other to internal.

Also u can connect VWICs back to back, no problem

Regards

Jawwad

jawwadh19@yahoo.com