From: Andy mrozek (andymrozek@yahoo.com)
Date: Fri Aug 06 2004 - 20:13:39 GMT-3
Could you block multicast traffic say on SW3 ? So that
the group 224.0.0.2 does not come down that trunk ?
--- Andy mrozek <andymrozek@yahoo.com> wrote:
> Request for opinions thoughts........... In a
> "campus
> design" where you have say core SW1 and core SW2 at
> the hub of the network which houses main centralized
> data centers and majority of network resources...
> What
> is the preferred method of connecting core Sw1 and
> core Sw2 ....... I have noticed the following :
>
> SW1 = core Fast0/1 and Fast0/2 are trunked and
> channeled to the same ports on core SW2 represented
> by
> the 2 dotted lines between in diagram below....
>
> SW3 = represents a physically remote site attatched
> by
> x2 single mode fiber runs say over a 6 mile distance
> within a city......
>
> All switches are within the same vtp domain so all
> vlans are same throughout domain..... If we do
> intervlan routing on SW1 / SW2 say via a sup engine
> 4
> or 5 in a catalyst box and run HSRP for redundant
> default gateways for all the remote sites and say in
> the below diagram SW3 is root for Vlan 50 which is
> permitted across all trunk links , so that means
> port
> channel between SW1 and SW2 core's will block as
> they
> will always have there root port , which in this
> case
> SW3 in a forwarding state..... My observations are
> via sniffing / debugging that the hsrp communication
> is obviously going to pass between SW1/SW2 through
> SW3
> .... I don't see of a way to avoid that
> situation...
> and it would seem that this method of campus design
> would not be scalable ... What if we had say 1000
> remote sites hence 1000 + SW3's ..... trunking up to
> the core ......... even with a well thought out vlan
> pruning we would have all this multicast hsrp from
> 224.0.0.2 shooting throuout the network between the
> core switches...
> Any thoughts ??? Thanks Andy
>
> SW1 ------------- SW2
> -------------
> | |
> | |
> | |
> | |
> \ /
> \ /
> \ /
> \ /
> SW3
>
> =====
> -Andy Mrozek
>
> There are only 10 types of people in this world...
> those who understand binary, and those who
> don't.....................
>
>
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