Nortel Switch and Cisco Router Port Speed Problem

[telefon45]

Hi

I have problems with speed ports. I adjust Nortel Switch ports and Cisco ports auto but ? receive CRCs. What do you suggest me?


Thank you

 

[HungryHouse]

I suggest you lock the ports to the matching speed and duplex of what you want and take it off auto-sense....for example full duplex and 100mbps.

 

[telefon45]

I did like that, but it suppose to detect speed. If i manually adjust speed it is to much work because i have to many ports to configure.Anyway thank you.

My question is: is it normal that cisco and nortel does not negotiate with the speeds.

Thank you

 

[HungryHouse]

It is a complete crapshoot my friend. Since auto-sense/auto-negotiation is not a true 802.1 standard each vendor interprets it different, and even WITHIN the vendor product, there are difference between families. We have dozens of Cisco switches that connect fine with dozens of Nortel switches just fine, however, dozens wont as well. If you are sure you don't have a cable problem...aka you arent using straight through cables on MDIX to MDIX ports, or poorly terminated cat5, then yes, you will potentially have to manually configure ports prior to connectivity.
I hope this info is helpful.

-HH

 

[jimbopalmer]

Cisco gear has traditionally interpreted the auto negotiate standard differently than all other vendors. With newer software this is getting better.

"If i manually adjust speed it is to much work because i have to many ports to configure."

How many Cisco routers do you have?

I tried to remain child-like, all I acheived was childish.

 

[telefon45]

Actually we are using Cat5 - cat5e and Cat 6 cables. Our system is old and we can not change the cables because system is active.. And we have around 20 cisco routers. During setting up the speed will there be a connection loss?

Thank you.

 

[anthonyanderberg]

I'd expect a short connection loss during the change, and you'll want to be right there using a console cable in case something goes wrong that would drop your remote connection.