From: John (jgarrison1@austin.rr.com)
Date: Mon Jan 07 2008 - 14:32:57 ARST
I am tasked with configuring dot1q trunking between R4, R5, SW3, and SW4. R4
is trunking to R5 via e0/0.45. R4 is trunking to SW3 via e0/0.49. R5 is
trunking to SW4 via e0/0.40. R5 is trunking to R4 via e0/1.45. R5 is
trunking to SW3 via e0/1.59. R5 is trunking to SW4 via e0/1.50.
I'm having problems understanding a couple of things. first how R4 and R5
for example can have trunks to three different devices coming into a single
interface. second in the diagram it has the interfaces for the trunks on the
switches as vlan40 and vlan50 on SW4 and vlan49 on SW3. Those are not
physical interfaces. The solution says that I should be configuring SW2 f0/4
and SW3 f0/5. I'll assume that SW2 is supposed to be SW4 it's still short one
trunk port.
How am I supposed to determine which switch interfaces to use in a situation
like this and if someone can please explain how three devices each with a
seperate physical connection can attatch to a single physical interface on
another device I would appreciate it
thanks
JG
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