From: csaez (csaez@satec.es)
Date: Mon Feb 09 2004 - 21:02:18 GMT-3
Hello,
I have some issues with the 3550 that I need to clarify if possible:
I have set a lab with two 3550 with 12.1(19)EA1a-EMI loaded and got some
estrange results:
1 - RSPAN: I was not able to make it work.
Here is my configuration:
SW-1#sh run | include monitor
monitor session 1 source interface Fa0/14
monitor session 1 destination remote vlan 4 reflector-port Fa0/23
SW-2#sh run | include monitor
monitor session 1 destination interface Fa0/2
monitor session 1 source remote vlan 4
And outputs:
SW-1#sh monitor session 1
Session 1
---------
Type : Remote Source Session
Source Ports :
Both : Fa0/14
Reflector Port : Fa0/23
Dest RSPAN VLAN: 4
SW-2#sh monitor session 1
Session 1
---------
Type : Remote Destination Session
Source RSPAN VLAN: 4
Destination Ports : Fa0/2
Encapsulation : Native
Ingress: Disabled
I did not get anything at the destination port. I could check that RSPAN
VLAN (4) was not pruned in the trunk connecting both switches.
QUESTIONS:
- I guess that the reflector port is for internal use only and you can
leave it disconnected. RSPAN traffic is transported through regular
trunk connections, right?
- I had to force the VLAN 4 not to be pruned in the trunk kind of
artificially (declaring interface VLAN 4 in both switches). I mean, if I
only use the RSPAN VLAN
to transport this kind of traffic how can I manage to make this vlan not
be pruned? Activating RSPAN didn4t seem to be enough.
- Any experience with this?
2- VLAN filtering with regular SPAN.
I set a regular SPAN session to sniff a trunk port. I configured the
filter vlan feature in order to capture only one or two but there was no
way. I got always the whole
bunch of VLANs.
QUESTIONS:
- Any experience with this?
3- MAC vlan maps:
I just want to make sure about this. MAC vlan maps affect all traffic
but IP. So if you apply a vlan map of this kind youd better take care
because it affects regular ARP (CDP, VTP, etc if you apply it to VLAN
1). At least, that was what happened to me. I set a little mac filter
allowing some LSAPs and all my IP-ARP traffic got dropped.
QUESTIONS:
- Am I right with this?
I would like to know whether I am doing/assuming something wrong.
Thanks in advance,
Cesar.
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