Hi all,
Here is the story and make it simple.
I had a Nortel networks with couples of 450-24Ts (Named as A450 and B450) and 5510-48T (Named as A5510) in single VLAN1.
Connection as below:
A5510 ==(2 x 100M MLT)==> A450 ==(2 x 100M MLT) ==> B450
Workstation 1 (WS1) connected to A5510.
Server 1 (SVR1) and Server 2 (SVR2) connected to A450.
Workstation 2 (WS2) and Workstation 3 (WS3) connected to B450.
Normal stage, all workstations and servers can talk/ping with each others.
On problem stage;
WS2 cannot talk to SVR1 and SVR2 but WS3 can reach SVR1 and SVR2. (WS2 and WS3 in same B450 switch)
At the same time, WS1 can talk to WS2 and vice vise without problem.
After many times of trying, I found a temporary solution.
Physical disconnect one leg of MLT between A5510 and A450, wait 1 minutes and pull back.
About 10 to 20 hours, another workstation (WS4) at B450 have the same problem again.
So, I think some kind of Spanning-Tree problem happened on the networks.
Are there any expertise over here can give me a hint to trouble shoot this problem.
Thanks in advance.
Here is the story and make it simple.
I had a Nortel networks with couples of 450-24Ts (Named as A450 and B450) and 5510-48T (Named as A5510) in single VLAN1.
Connection as below:
A5510 ==(2 x 100M MLT)==> A450 ==(2 x 100M MLT) ==> B450
Workstation 1 (WS1) connected to A5510.
Server 1 (SVR1) and Server 2 (SVR2) connected to A450.
Workstation 2 (WS2) and Workstation 3 (WS3) connected to B450.
Normal stage, all workstations and servers can talk/ping with each others.
On problem stage;
WS2 cannot talk to SVR1 and SVR2 but WS3 can reach SVR1 and SVR2. (WS2 and WS3 in same B450 switch)
At the same time, WS1 can talk to WS2 and vice vise without problem.
After many times of trying, I found a temporary solution.
Physical disconnect one leg of MLT between A5510 and A450, wait 1 minutes and pull back.
About 10 to 20 hours, another workstation (WS4) at B450 have the same problem again.
So, I think some kind of Spanning-Tree problem happened on the networks.
Are there any expertise over here can give me a hint to trouble shoot this problem.
Thanks in advance.