From: Fabrice Paz (fabrice.paz@googlemail.com)
Date: Tue Jan 23 2007 - 19:11:36 ART
Hi GS,
I have a problem understanding VLAN traffic, here the question
R6
|
|
|Fa0/6
R1--------------SW1--------------R2
R1 and R2 are both in VLAN12 (12.0.0.1/8 & 12.0.0.2/8)
Configure SPAN on SW1 to redirect all traffic from VLAN 12 to R6
My answer to that is;
monitor session 1 source vlan 12
monitor session 1 destination interface Fa0/6
The correct answer is;
monitor session 1 source vlan 12 rx
monitor session 1 destination interface Fa0/6
1) Should I understand the question as "Configure SPAN on SW1 to redirect
all traffic leaving VLAN 12 to R6"?
2) There is no SVI on the topology, if my poitn 1) is right is that making
sense to put an rx or tx for this kind of question?
To try to understand I have done the folowing test (I have removed keepalive
from all interface involved)
from R1 "ping 12.0.0.2 repeat 20" while SW1 is "monitor session 1 source
vlan 12 rx" a "show int Fa0/6" on SW1 show 40 packet output
from R1 "ping 12.0.0.2 repeat 20" while SW1 is "monitor session 1 source
vlan 12 tx" a "show int Fa0/6" on SW1 show 40 packet output
from R1 "ping 12.0.0.2 repeat 20" while SW1 is "monitor session 1 source
vlan 12" a "show int Fa0/6" on SW1 show 80 packet output
Results are exactly the same when pinging 255.255.255.255 from R1 in the
three scenarios. It's clear that rx an tx are affecting something
3) Any idea of what rx and tx mean in the case VLAN
4) Considering that "monitor session 1 source vlan 12" include both rx and
tx would that fail the task at the exam if they are expecting rx to be set?
Thanks,
Fab
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