IP Router Configuration Command Reference
188 Router Configuration Guide
static-arp
Syntax static-arp ip-addr ieee-mac-addr unnumbered
no static-arp unnumbered
Context config>router>interface
Description This command configures a static Address Resolution Protocol (ARP) entry associating an IP address
with a MAC address for the core router instance. This static ARP appears in the core routing ARP
table. A static ARP can only be configured if it exists on the network attached to the IP interface.
If an entry for a particular IP address already exists and a new MAC address is configured for the IP
address, the existing MAC address is replaced by the new MAC address.
The number of static-arp entries that can be configured on a single node is limited to 1000.
Static ARP is used when a router needs to know about a device on an interface that cannot or does not
respond to ARP requests. Thus, the router configuration can state that if it has a packet that has a certain
IP address to send it to the corresponding ARP address. Use proxy ARP so the router responds to ARP
requests on behalf of another device.
The no form of the command removes a static ARP entry.
Default No static ARPs are defined.
Parameters unnumbered — Specifies the static ARP MAC for an unnumbered interface. Unnumbered
interfaces support dynamic ARP. Once this command is configured, it overrides any dynamic
ARP.
ieee-mac-addr — Specifies the 48-bit MAC address for the static ARP in the form
aa:bb:cc:dd:ee:ff or aa-bb-cc-dd-ee-ff, where aa, bb, cc, dd, ee and ff are hexadecimal
numbers. Allowed values are any non-broadcast, non-multicast MAC and non-IEEE reserved
MAC addresses.
strip-label
Syntax [no] strip-label
Context config>router>interface
Description This command forces packets to be stripped of all (max 5) MPLS labels before the packets are handed
over for possible filter (PBR) processing.
If the packets do not have an IP header immediately following the MPLS label stack after the strip,
they are discarded. Only MPLS encapsulated IP, IGP shortcuts and VPRN over MPLS packets will be
processed. IPv4 packets that arrive without any labels are supported on an interface with strip-label
enabled, but labeled or unlabeled IPv6 packets are dropped.
This command is only supported on:
• Optical ports for the 7750 SR and 7450 ESS
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