From: Ron.Fuller@xxxxxx
Date: Wed Aug 30 2000 - 14:21:42 GMT-3
You can always use 802.1q for your VLAN trunking. Very similar to ISL,
with the exception that 802.1q has one instance of spanning tree for all
VLANs. This can be a real pain in the butt in some environments. I have
never tried IRB/CRB for this. I doubt it would work, but someone on the
list will probably prove me wrong! <g> I have not tried/worked with 802.10
(SDE)
HTH!
Ron Fuller, CCIE #5851, CCDP, CCNP-ATM, CCNP-Security, MCNE
3X Corporation
rfuller@3x.com
"Aaron DuShey"
<aaron.dushey@dushey-consu To: "CCIE \(E-mail\)"
<ccielab@groupstudy.com>
lting.com> cc:
Sent by: Subject: vlans
08/30/00 11:42 AM
Please respond to "Aaron
DuShey"
question-
What other methods are there for routing between VLANs besides
subinterfaces
w/ISL?
Can you use IRB/CRB to do this?
This is on a 3640 FastE interface.
Does this mean that if you don't have a 100MB interface on a router you can
use IRB to route between the vlans instead?
Little confused here...any help is greatly appreciated,
The doc cd states-but I am still not completely clear
Our VLAN Routing implementation is designed to operate across all router
platforms. However, the Inter-Switch Link (ISL) VLAN trunking protocol
currently is defined on 100 BaseTX/FX Fast Ethernet interfaces only and
therefore is appropriate to the Cisco 7000 and higher-end platforms only.
The IEEE 802.10 protocol can run over any LAN or HDLC serial interface.
VLAN
traffic is fast switched. The actual format of these VLAN encapsulations
are
detailed in the IEEE Standard 802.10-1992 Secure Data Exchange and in the
Inter-Switch Link (ISL) Protocol Specification.
Our VLAN Routing implementation treats the ISL and 802.10 protocols as
encapsulation types. On a physical router interface that receives and
transmits VLAN packets, you can select an arbitrary subinterface and map it
to the particular VLAN "color" embedded within the VLAN header. This
mapping
allows you to selectively control how LAN traffic is routed or switched
outside of its own VLAN domain. In the VLAN routing paradigm, a switched
VLAN corresponds to a single routed subnet, and the network address is
assigned to the subinterface.
Aaron DuShey
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