Switch User Manual

IP routing 19
If secondary interfaces are configured on the management VLAN, routing
cannot be disabled globally or on the management VLAN. Secondary IP
interfaces on the management VLAN are purged from NVRAM when
•
a unit leaves the stack and the switch does not have a manually
configured IP
•
the switch fails to get the IP address through the BootP mode
The following are not supported on secondary interfaces:
•
DHCRP
•
Proxy ARP
•
UDP broadcast
•
IPFIX
•
VRRP, OSPF, RIP
For information about configuring secondary interfaces on VLANs, see "IP
routing using VLANs" (page 16).
Brouter port
The Nortel Ethernet Routing Switch 5500 Series supports the concept
of brouter ports. A brouter port is a single-port VLAN that can route IP
packets as well as bridge all non-routable traffic. The difference between
a brouter port and a standard IP protocol-based VLAN configured to do
routing is that the routing interface of the brouter port is not subject to
the spanning tree state of the port. A brouter port can be in the blocking
state for non-routable traffic and still be able to route IP traffic. This feature
removes any interruptions caused by Spanning Tree Protocol recalculations
in routed traffic. A brouter port is actually a one-port VLAN; therefore, each
brouter port decreases the number of available VLANs by one and uses
one VLAN ID.
When a brouter port is created, the following actions are also taking place
on the switch:
•
A port-based VLAN is created.
•
The brouter port is added to the new port-based VLAN.
•
The PVID of the brouter port is changed to the VLAN ID of the new
VLAN.
•
The STP participation of the brouter port is disabled.
•
An IP address is assigned to the brouter VLAN.
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
.