User guide

11-14 E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
IP U
NICAST
R
OUTING
I
SOLATION
O
PTION FOR
C
OMMUNICATION
B
ETWEEN
S
UB
-VLAN
S
To facilitate communication between sub-VLANs, by default, an entry is made in the IP
ARP table of the super-VLAN that performs a proxy ARP function. This allows clients
on one sub-VLAN to communicate with clients on another sub-VLAN. In certain
circumstances, intra-sub-VLAN communication may not be desired for isolation
reasons.
To prevent normal communication between sub-VLANs, disable the automatic addition
of the IP ARP entries on the super-VLAN, using the command:
disable subvlan-proxy-arp vlan <super-vlan name>
The isolation option works for normal, dynamic, ARP-based client
communication.
VLAN A
GGREGATION
C
OMMANDS
Tab le 11-2 describes VLAN aggregation commands.
Table 11-2: VLAN Aggregation Commands
Command Description
config vlan <super-vlan name> add
secondary-ip <ipaddress> {<mask>}
Adds a secondary IP address to the
super-VLAN for responding to ICMP ping
requests.
config vlan <super-vlan name> add subvlan
<sub-vlan name>
Adds a sub-VLAN to a super-VLAN.
config vlan <super-vlan name> delete
secondary-ip <ipaddress> {<mask>}
Deletes a secondary IP address to the
super-VLAN for responding to ICMP ping
requests.
config vlan <super-vlan name> delete subvlan
<sub-vlan name>
Deletes a sub-VLAN from a super-VLAN.
disable subvlan-proxy-arp vlan [<super-vlan
name> | all]
Disables sub-VLAN entries in the proxy ARP
table.
enable subvlan-proxy-arp vlan [<super-vlan
name> | all]
Enables the automatic entry of sub-VLAN
information in the proxy ARP table.