It's probably me but could someone have a look at this link in Cisco's campus network design doc -
http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/HA_campus_DG/hacampusdg.html#wp1108489
scroll down to figure 41 where the distribution switch interconnect is blocking and both access layer switch uplinks are forwarding. If vlan 2 is on both access-layer switches does this not form a L2 loop ? The diagram shows both switches forwarding on vlan 2 on both links but to me that seems as though a packet such as a broadcast could origiinate on one access-layer switch and then end up back there.
If each access-layer switch had it's own vlan then i could understand the logic but not with both switches having the same vlan.
Am i missing something ?
Incidentally this is linked to the question about GLBP and STP in case anyone wants some more context.
Jon
