From: Philip Lai (philip.lai@xxxxxxx)
Date: Thu Aug 10 2000 - 10:22:43 GMT-3
Network Design issue.
6500(L3)- 6500 (L3) Core
/ \
4908G(L3) 4908G(L3) Distribution
/ \ / \
2924M 2924M 2924M 2924M Access
A B C D
Vlan1 Vlan2 Vlan3 Vlan4
Server Farm will be directly attached to the Core. There will be some
departmental servers in zone A for both zone A and B users.
My friend has designed a switching network like this and claim that it will
have better performance than using 3508G (L2) in the distribution layer.
Since the 4908G has the L3 routing feature, when zone A transfer packet to
zone B, that traffic will pass only the 4908G but not the 6500 (Core). Thus,
the bandwidth from the 6500 to 4908G can be saved.
My questions:
1. If both the Core and Distribution switch are routing enabled, that
switches has to be the VTP server. ie: 4 indentical Vlan database are keep
by each switches (Core & Dist.)
2. Does it meaningful to configure trunk mode between all switches in order
to pass the Vlan information ? If all 2924M are in VTP clients mode, which
switches should be the VTP server ? and why?
3. A crazy idea is to think about the L3 switches as a individual router.
Then apply OSPF between to each one and enable routing. Will the network be
quite slow for this design, compared with the standard design.-- Core
(Routing)--Dis(Switching)---Access(Switching) ?
4. In fact, I recommend the stand design using 3508G for dist. But could you
tell me the adv and Disadv for using this and the design above ?
Thank you very much for every reply
Philip Lai
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