I have a Trunked ring of 4-2950 Switches. All support RSPAN. I want to monitor ports Fa0/2 off of BOTH switch A & B. My sniffer is off port Fa0/23 on switch D. RSPAN VLAN =900, Reflector ports are Fa0/22 on both A & B.
However, my sniffer only detects data on Fa0/2 off Switch A. It does NOT see any data from Fa0.2 off Switch B. Hope someone knows what the heck I did wrong. Thanks.
From the 2950 config guide on RSPAN restrictions/guidelines.
In a network consisting of only Catalyst 2950 or Catalyst 2955 switches, you must use a unique RSPAN VLAN session on each source switch. If more than one source switch uses the same RSPAN VLAN, the switches are limited to act only as source switches to ensure the delivery of all monitored traffic to the destination switch.
The way you have your switches setup for A to get to D it has to go through B so B is an intermediate switch as i read it. But according to the above it can't be. What's confusing me and what makes me unsure this is the problem is that i would have thought you would have seen traffic from switch B not switch A.
Maybe i'm misunderstanding it. It might be worth trying to use a separate RSPAN vlan for each switch to see if it fixes the issue.
Maybe I am misunderstanding the RSPAN restrictions/guidelines. I want A & B to only act as source switches (Fa0/2 in each case) and D to act as the destination switch. Hence, I had only a single RSPAN VLAN.
I tried multiple RSPAN VLANs ... but then D can only see the RSPAN VLAN for A or B, the intent is to see A and B.
I also am surprised that I can only see A, thru B or C ... I can't tell, while traffic from B is not seen on D and they are directly trunked.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...