only 4 octets are added to the frame, as compared to the 30 added in ISL.
Also, the 802.1q information is not wrapped around the original packet--
the VLAN information is inserted into the frame, following the destination
and source addresses in the original packet. This lack of overhead is another
benefit of 802.1q.
rare that the problem is directly related to the tag information itself,
although administrators should consider this in researching trunk problems.
Rather, most trunking problems, along with 802.1q, result from misconfig-
uration of the VLANs or mismatches between two sides of the trunk.
Although they serve similar functions, ISL cannot connect to 802.1q on the
same link.
inform all other switches in the VTP domain about the VLANs within the
domain. This domain is a management domain that allows control of the VTP
multicast updates. A switch may be configured with three different VTP settings.
domain. When a change is detected, it is propagated throughout the domain.
Manual manipulation of the VLAN table may be performed on a VTP Server.
Trunk ports are then reconfigured to allow traffic from the new VLAN.
for the domain. It will transmit any changes to its known VLANs. When
a change is detected, the trunk ports are then reconfigured to allow traffic
from the new VLAN.
to allow the reconfiguration of the new VLAN. It does, however, continue
to forward VTP advertisements.