Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 763)

Multi-Service IronWare Switching Configuration Guide 733
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Configuring IP parameters
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• DHCP option 82 (refer to “Enabling DHCP snooping on a VLAN” on page 764)
• Static DAI entries (refer to “Configuring DAI” on page 755)
Syntax: [no] ip unnumbered-arp-suppression
Use the no ip unnumbered-arp-suppression command to disable ARP suppression on the interface.
This command is applicable only to donor and unnumbered interfaces. It has no effect on other
interfaces.
You can use the show ip interface command to display whether ARP suppression is enabled or
disabled, as shown in
“Displaying unnumbered interfaces” on page 731.
Caveats and limitations for IP Unnumbered Interfaces
• The IP Unnumbered Interfaces feature is not supported for IPv6 addresses.
• Multicast and MPLS protocols are not supported on donor interfaces.
• Routing protocols, multicast, and MPLS are not supported on the unnumbered interfaces.
• The IP Unnumbered Interfaces feature is supported only on the default VRF. Both donor and
the unnumbered interfaces must be in the default VRF.
• If the donor interface is down (link state or administrative state), a ping to the donor IP address
fails, even if the unnumbered interfaces that inherited the IP address are up.
• VRRP and VRRP-E operations are not supported on unnumbered interfaces.
• RPF strict mode is not supported on unnumbered interfaces.
Configuration considerations for IP Unnumbered Interfaces
• You can have multiple donor interfaces in the device. A donor interface can have multiple
unnumbered interfaces inheriting its IP address. An unnumbered interface can have only one
donor interface.
• You can configure multiple primary and multiple secondary IP addresses on the donor
interface. The unnumbered interface inherits all primary and secondary addresses of the
donor interface.
• The unnumbered interface inherits only the IP address from the donor interface. All other
donor interface configurations are not passed on to the unnumbered interface. You must
configure other features, such as IP Source Guard and forwarding of directed broadcasts, on
the unnumbered interfaces separately.
• The following routing protocols are supported on the donor interface:
- Open Shortest Path First (OSPF)
- Intermediate System - Intermediate System (IS-IS)
- Routing Information Protocol (RIP)
- Border Gateway Protocol (BGP)
• If DHCP clients are configured on an unnumbered interface, then DHCP option 82 must be
configured on that interface; otherwise, the DHCP client cannot get the IP address from the
DHCP server.