From: Aaron DuShey (aaron.dushey@xxxxxxxxxxxxxxxxxxxxx)
Date: Wed Aug 30 2000 - 12:42:27 GMT-3
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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