Groupstudy's CCIE Discussion list:

Groupstudy's Cisco CCIE Certification Discussion list is another great resource, especially for those who haven't yet completed the CCIE Written portion. As I have only one 3550 switch to practice routing on, and 3 2950s, I wondered how I could route across the 2950s. The following posting entitled "Routng between 3550 and 2950" explains it. See below:



HI Experts,


Following is my topology:-

R1(2611) <---> R2(2611) <---->SW1(3550) ======SW2(2950) <----->
R3(2611) <----->R4(2611)

Note:- Link between the SW1 & SW2 is etherchannel

My query is:-

1. Can the routes be received from R1 to R4.If yes then how should be
the Switches configured coz one of them is Layer 2 and the other is
Layer 3

What I have done so far:-

1. I tried configuring SW1 as layer 3 interface and sw2 as layer 2 on
one of the Interface . the link came up but still couln't get routes
from R1 to R4. I did this configuration by deleting the etherchannel
between the 2 switches. I think this is a wrong configuration but I
don't knowhow I should make the packets reachable in this scenario.



--
Warm Regards
Raghav


RESPONSE:



One option creat whaterver L3 SVi on 3550 say
!
Int vlan 33
ip addr 33.33.33.1/24
!

On the interface connecting to the L2 switch.. just say sw acc vl 33 and the
same command on the interface connecting to R3

On R3.
int eth0/0
ip add 33.33.33.3/24
!

You should be able to ping between Sw1 and R3 then. You could also leave the
link between sw1 and sw2 to be a trunk and just make changes on the link
connecting to R3.

Do read Lan Switching by Clark should help you out with most switching tech.

-Hoogen