Foundry Configuration Guide for the FESX, FSX, and FWSX
11 - 38
© Foundry Networks, Inc.
December 2005
NOTE:
If the Foundry device’s ARP table does not contain the requested host, the Foundry device forwards
the ARP request on Layer 2 to the same VLAN as the one that received the ARP request. Then the device
sends an ARP for the destination to the other VLANs that are using the same IP sub-net address.
•
If the destination is in the same VLAN as the source, the Foundry device does not need to perform a proxy
ARP.
To configure multiple VLANs to use the same IP sub-net address:
•
Configure each VLAN, including adding tagged or untagged ports.
•
Configure a separate virtual routing interface for each VLAN, but do not add an IP sub-net address to more
than one of the virtual routing interfaces.
•
Configure the virtual routing interfaces that do not have the IP sub-net address to “follow” the virtual routing
interface that does have the address.
To configure the VLANs shown in Figure 11.15, you could enter the following commands.
FastIron SuperX Router(config)# vlan 1 by port
FastIron SuperX Router(config-vlan-1)# untag ethernet 1/1
FastIron SuperX Router(config-vlan-1)# tag ethernet 1/8
FastIron SuperX Router(config-vlan-1)# router-interface ve 1
Syntax:
ip follow ve <num>
The commands above configure port-based VLAN 1. The VLAN has one untagged port (1/1) and a tagged port
(1/8). In this example, all three VLANs contain port 1/8 so the port must be tagged to allow the port to be in
multiple VLANs. You can configure VLANs to share a Layer 3 protocol interface regardless of tagging. A
combination of tagged and untagged ports is shown in this example to demonstrate that sharing the interface does
not change other VLAN features.
Notice that each VLAN still requires a unique virtual routing interface.
The following commands configure port-based VLANs 2 and 3.
FastIron SuperX Router(config-vlan-1)# vlan 2 by port
FastIron SuperX Router(config-vlan-2)# untag ethernet 1/2
FastIron SuperX Router(config-vlan-2)# tag ethernet 1/8
FastIron SuperX Router(config-vlan-2)# router-interface ve 2
FastIron SuperX Router(config-vlan-2)# vlan 3 by port
FastIron SuperX Router(config-vlan-3)# untag ethernet 1/5 to 1/6
FastIron SuperX Router(config-vlan-3)# tag ethernet 1/8
FastIron SuperX Router(config-vlan-3)# router-interface ve 3
The following commands configure an IP sub-net address on virtual routing interface 1.
FastIron SuperX Router(config-vlan-3)# interface ve 1
FastIron SuperX Router(config-vif-1)# ip address 10.0.0.1/24
The following commands configure virtual routing interfaces 2 and 3 to “follow” the IP sub-net address configured
on virtual routing interface 1.
FastIron SuperX Router(config-vif-1)# interface ve 2
FastIron SuperX Router(config-vif-2)# ip follow ve 1
FastIron SuperX Router(config-vif-2)# interface ve 3
FastIron SuperX Router(config-vif-3)# ip follow ve 1
NOTE:
Since virtual routing interfaces 2 and 3 do not have their own IP sub-net addresses but instead are
“following” virtual routing interface a’s IP address, you still can configure an IPX or AppleTalk interface on virtual
routing interfaces 2 and 3.
Содержание FastIron Edge Switch X424
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