I have 2 Cisco 2950G-12-EI, S1&S2 connected with two uplink cable as the other one is redundant.
S1/P11 connected to S2/P11
S1/P12 connected to S2/P12(Blocking State)
How I can enable the S2/P12 to forward state, so that if I have a host connected in S1&S2, I want to Ping from HostA(S1) to Host(S2) or vice versa and I dont want to encounter any timeout even I remove anyone of the uplink cable. Please help me to solve this issue, thanks.
The concept of STP is to block redundant link for loop avoidance. In your setup there is a loop and STP is doing its job blocking redundant port and once your primary link goes down second link which is currently in blocking state will become active but YES that will take its own convergance time and there will be loss of connectivity for few seconds.
WHY don't you configure etherchannel for the 2 links so that both the interfaces will be in fwding state and if any of the link in etherchannel goes down you still have second lin kin that etherchannel to take care of your data traffic.
Hi, thanks for the information. I know etherchannel is the solution, but my boss wants this scenario. He wants to connect a 3 2950G-12-EI switch with loop and another redundant loop a total of 12 physical ports to be combine or channel-group as one logical ports. The questions is, is it possible to balance the two logical ports on a forwading state, so that even he remove any uplink connections he will not encounter any timeout while he's pinging from HostA(S1) to HostB(S2). I'll attached here the diagram of the scenario. I already use #channel-group 1 mode desirable non-silent, but as far as I know, a one channel-group has only eigth members port allowed, but on this scenario it has a total of 12 ports that needs to combine as on logical ports, so that all the ports are in forwading state. I know this really overkill connection, im just following my boss. I hope you can help me to solve this or just give a good explanation if this is not possible. Thank you and I will wait for your reply.
Hi, thank you for your help. I created a 3 logical channel in this scenario. Another questions, how I can minimize the timeout once I remove the first logical port. I'd try #span vlan 1 forward-time 4 and #span uplinkfast max-update-rate 1 on 3 switches. But once I removed the channel-group 1 that has 2 uplink ports, I encounter a 5 timeout a total of 20 seconds, is it possible to minimize this up to 2 timeout? thanks.
2. Chek if you have RSTP support on the switches, if you have RSTP, then change the STP mode to it on all the switches. This will result in a faster convergence of the network topology and you will get the desired results that you are looking for.
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