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to prevent loops you have the following options: enable stp with faststart on access ports enable BPDU filtering on access ports SLPP on the core (per vlan basis)

you will also need to upgrade diag first. It is only one time operation from v 4 to 5.

Hello guys, Want to ask those who have experience working with this router. I especially care about firewall(acls) and routing features. So I guess to run two 4134 at the edge sites instead of two 8600s. These devices will be connected to 5520s as well. We plan to have maximum 200 PCs at each...

I solved all issues to the moment. Found some problems with mlt. What i mentioned in one situation - disable-enable mlt helps. Thank you DaddyOfThree for help and attention.

Guys, sad to say. One morning second link was down... So...After some attempts to establish situation I mentioned the following: We have 2x8610(4.1.4) in the core and 5520(ver 5.0.7.017) as access layer(stacked x2). 03/07 morning this switch 5520 comes down from 1 working link. From that time...

Guys, i appreciate your help! Now after playing games with all these switches, I established 2 links with 2 switches, so...couple of things, last one was smlt was not created on core. Now I wait for cable guys to test other 3 switches, I checked configs and seems ok, the only thing i found -...

Have you enabled and configured VLACP on the ERS8600? -Yes, it was enabled. I checked both 8600 using DM and found that for uplink port it is adminenable, fastperiodictimer is 500 and timeout is short. If i disable vlacp in general could it cause problems for other part of our production...

Thank you, I configured VLACP and now i have 1 link, but still instead of 2. I did as you wrote me. After I have on 5520: #show interfaces 1/48,2/48 Flow Unit/Port Trunk Admin Oper Link LinkTrap Negotiation Speed Duplex Control 1/48 1 Enable Up Up Enabled Enabled 1000Mbps Full Asymm...

Thank you Sir for your answer, it really could help me. I still cant understand in this copfig: no mlt mlt 1 name "Trunk #1" enable member 1/48,2/48 learning normal mlt 1 learning normal mlt spanning-tree 1 stp 1 learning normal mlt 1 bpdu all-ports 2 and 3 commands belongs to MLT learning or...

I am going to do software upgrade on all 5520 and 8600 in the network, which version is the best and stable?

Thank you for your answer! I am going to check all about STP in network, I had no idea about STP and MLT conflicts. Yes, for MLT i have the following: ! *** MLT *** no mlt mlt 1 name "T#1" enable member 1/48,2/48 learning normal mlt 1 learning normal mlt spanning-tree 1 stp 1 learning normal...

When we upgrade firmware we lost config - is it ok? reconfiguration looks like a long copy paste process.

We have 2x8600 in the $core and 5520(ver 5.0.7.017) as access layer(stacked x2). So for some switches observe strange behavior - 1 of 2 uplinks is working, another is not. we checked fiber, gbics. So it seems the problem is with STP, all looks good from the configuration point of view. And...