Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 764)

734 Multi-Service IronWare Switching Configuration Guide
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Configuring IP parameters
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• If reachability is needed between two hosts within the same subnet, you must configure local
proxy ARP on the unnumbered interfaces. Refer to
“Enabling local proxy ARP” on page 752 for
more information.
Static route considerations for unnumbered interfaces
• If you configure a static route with an unnumbered interface or donor interface as the next hop,
it is recommended that you configure a standard static route instead of an interface-based
static route.
• If you configure an interface-based static route on a donor or unnumbered interface, you must
ensure that ARP suppression is disabled on the interface. Refer to
“Enabling and disabling ARP
suppression” on page 732 for instructions.
Refer to “Static route types” on page 784 and “Configuring a static IP route” on page 786 for
information about static routes.
DHCP host subnet selection
If the donor interface is configured with multiple subnets, and the DHCP clients need to receive
addresses in a specific subnet, use the ip bootp-gateway command to select the local donor
interface IP address of the specific subnet.
This functionality can be used when the DHCP clients are moved from one subnet to another
subnet.
Refer to “Changing the IP address used for stamping BootP or DHCP requests” on page 821 for
instructions on using the ip bootp-gateway command. Note that the ip bootp-gateway command is
used only when the hosts are DHCP hosts.
Support for other features
IP address configurations are the only configurations that the unnumbered interfaces inherit from
the donor interface.
All other configurations (such as ICMP, ACLs, DHCP, and PBR) that are configured on the donor
interface apply only to the donor interface and are not inherited by the unnumbered interfaces. You
must configure these features separately on the unnumbered interfaces.
Sample configuration for IP Unnumbered Interfaces
This example shows how to configure IP unnumbered interfaces with a DHCP server. In this
example, loopback 1 is the donor interface, and ve 20 and ve 30 are the unnumbered interfaces.
First, configure an IP address on the donor interface. Then configure the two VE interfaces to
inherit the IP address of the donor interface.
Brocade (config)# interface loopback 1
Brocade (config-lbif-1)# ip address 10.10.10.1/24
Brocade (config-lbif-1)# vlan 20
Brocade (config-vlan-20)# router-interface ve 20
Brocade (config-vlan-20)# interface ve 20
Brocade (config-vif-20)# ip unnumbered loopback 1
Brocade (config-vif-20)# vlan 30