By "see both VLANs" I mean that I can ping a host in other VLAN (but
only if this host resides on other switch, on the same switch
everything is OK) - that is - unicasts are also forwarded to other
VLANs. And I am wondering if it is feature of these switches or bug or
misconfiguration.
Regards, Arvids
Tuesday, October 10, 2000, 1:26:47 AM, Asbjorn wrote:
Asbjorn Hojmark> I'm not sure if this directly relates to your problem (mainly
Asbjorn Hojmark> because I'm not sure what you mean by 'see both VLANs') but
Asbjorn Hojmark> let me comment on the VLAN part of those boxes...
Asbjorn Hojmark> The Grand Junction boxes (Catalyst 1900, 2820) have a somewhat
Asbjorn Hojmark> unorthodocs implementation of VLANs. This is mostly because it
Asbjorn Hojmark> has only one MAC address table, not one per VLAN.
Asbjorn Hojmark> So MAC broadcasts will be forwarded on all VLANs (so much for
Asbjorn Hojmark> a VLAN being a broadcast domain) while unicasts will only be
Asbjorn Hojmark> forwarded to hosts in the same VLAN.
Asbjorn Hojmark> And if you use the switch between two routers running HSRP for
Asbjorn Hojmark> those VLANs, you'll have to explicitly set the MAC address for
Asbjorn Hojmark> each VLAN on the router.
Asbjorn Hojmark> HTH,
Asbjorn Hojmark> -A
Asbjorn Hojmark> --
Asbjorn Hojmark> Heroes: Vint Cerf & Bob Kahn, Leonard Kleinrock, Robert Metcalfe
Asbjorn Hojmark> Links : http://www.hojmark.org/networking/
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