L2 or L3 link between distribution swithes?

If you post some pointers to documents (and locations in those) documents describing the cases someone may have a look.

The one thing you do not want is unicast flooding.

The following document has a picture on page 66. There is a L2 link used between distribution switches. In the next page there is a L3 link. It says there that the L2 solution should only be used if layer 2 spanning flexibility is required. What does that "flexibility" mean?

-Sami

"aquarius" ha scritto nel messaggio news:%tgBh.48413$ snipped-for-privacy@news2.nokia.com...

Hi,

VLAN flexibility is this case means the capability to span the same VLAN id among multiple access switched served by the same distribution block, so you need a Layer 2 trunk between distribution switches ( this isn't a recommended design by cisco, unless your data block is a data center or has particular needs )

Obviously if you need to do that you could deploy either a L2 Trunk and a L3 path between distribution switches.

Regards, Gabriele

Hi,

yes, we need to use same VLAN id among multiple access switches. Therefore I guess that we have to use L2 link between distribution switches?

-Sami

"aquarius" ha scritto nel messaggio news:9XcCh.48486$ snipped-for-privacy@news2.nokia.com...

Hi,

yes, it's better to have a L2 trunk then. ( try to have it in (R)STP discarding/blocking state under normal circumstances )

Regards, Gabriele