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16 An Introduction to IP Routing Protocols
Variable-length subnet masking (VLSM) is the ability to divide an intranet
into pieces that match network requirements. Routing is based on the
longest subnet mask or network that matches.
IP routing using VLANs
The Nortel Ethernet Routing Switch 5500 Series supports wire-speed IP
routing between virtual LANs (VLAN). This type of routing is also referred to
as virtual routing. When a virtual router interface is created for a specified
VLAN, a specific IP address is associated with the specific VLAN. In this
release, the Nortel Ethernet Routing Switch 5500 Series supports static
routing, in which the identifiers of the devices being routed between are
entered manually.
This virtual router interface does not have an association with any specified
port or set of ports (it is called a virtual router interface because it is not
associated with any particular port). The VLAN IP address can be reached
through any of the ports in the VLAN specified as a virtual router interface,
and the assigned IP address is the gateway through which packets are
routed out of that VLAN. Routed traffic can be forwarded to another VLAN
within the switch or stack of Nortel Ethernet Routing Switch 5500 Series.
Once routing is enabled on two VLANs by assigning IP addresses, routing
can be performed between those two VLANs (refer to "IP routing with
VLANs" (page 16)).
IP routing with VLANs
IP routing is enabled or disabled globally on the Nortel Ethernet Routing
Switch 5500 Series. By default, IP routing is disabled.
Note: All IP routing parameters can be configured on the Nortel
Ethernet Routing Switch 5500 Series before routing is actually enabled
on the switch.
There is no longer a one-to-one correspondence between the physical
port and the router interface, because a given port can belong to multiple
VLANs. The VLANs may be configured for routing on the switch.
Nortel Ethernet Routing Switch 5500 Series
Configuration-IP Routing Protocols
NN47200-503 03.01 Standard
5.1 27 August 2007
Copyright © 2005-2007, Nortel Networks
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