User guide

E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
11-11
VLAN A
GGREGATION
3 Configure a default route, using the following command:
config iproute add default <gateway> {<metric>} {unicast-only |
multicast-only}
Default routes are used when the router has no other dynamic or static route to the
requested destination.
4 Turn on IP routing for one or all VLANs, using the following command:
enable ipforwarding {vlan <name>}
5 Turn on RIP or OSPF using one of the following commands:
enable rip
enable ospf
V
ERIFYING THE
IP U
NICAST
R
OUTING
C
ONFIGURATION
Use the
show iproute
command to display the current configuration of IP unicast
routing for the switch, and for each VLAN. The
show iproute
command displays the
currently configured routes, and includes how each route was learned.
Additional verification commands include the following:
•
show iparp
— Displays the IP ARP table of the system.
•
show ipfdb
— Displays the hosts that have been transmitting or receiving packets,
and the port and VLAN for each host.
•
show ipconfig
— Displays configuration information for one or more VLANs.
VLAN A
GGREGATION
VLAN aggregation is an ExtremeWare feature aimed primarily at Service Providers. The
purpose of VLAN aggregation is to increase the efficiency of IP address space usage. It
does this by allowing clients within the same IP subnet to use different broadcast
domains while still using the same default router.
Using VLAN aggregation, a super-VLAN is defined with the desired IP address, but
without any member ports (unless it is running ESRP). The sub-VLANs use the IP
address of the super-VLAN as the default router address. Groups of clients are then
assigned to sub-VLANs that have no IP address, but are members of the super-VLAN.
In addition, clients can be informally allocated any valid IP addresses within the subnet.
Optionally, you can prevent communication between sub-VLANs for isolation purposes.