From: Erick B. (erickbe@xxxxxxxxx)
Date: Wed Aug 30 2000 - 18:48:57 GMT-3
>From my knowledge, Cisco only supports trunking (ISL
or 802.1q) on 100meg interfaces to date (correct me if
I'm wrong - need to do more VLAN work). Some modules
support ISL and some 802.1q. If you can't use a
trunking protocol then the only other way to route
between VLANs is to make the switch-port a member of
all the VLANs and multinet the router interface so it
has address's for all the networks. Not a pretty
solution but it works.
- Erick
--- Aaron DuShey <aaron.dushey@dushey-consulting.com>
wrote:
> 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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