Specifications

IP Switching Commands
mls erm priority
ISW-90
Cisco IOS IP Switching Command Reference
May 2008
mls erm priority
To assign the priorities to define an order in which protocols attempt to recover from the exception status,
use the mls erm priority command in global configuration mode. To return to the default settings, use
the no form of this command.
mls erm priority ipv4 value ipv6 value mpls value
no mls erm priority ipv4 value ipv6 value mpls value
Syntax Description
Command Default The default settings are as follows:
• ipv4 is 1.
• ipv6 is 2.
• mpls is 3.
Command Modes Global configuration
Command History
Usage Guidelines This command is not supported on Cisco 7600 series routers that are configured with a Supervisor
Engine
2.
A lower value indicates a higher priority.
When a protocol sees a Forwarding Information Base (FIB) table exception, the protocol notifies the FIB
Embedded Resource Manager (ERM). The FIB ERM periodically polls the FIB table exception status
and decides which protocol gets priority over another protocol when multiple protocols are running
under the exception. Only one protocol can attempt to recover from an exception at any time.
If there is sufficient FIB space, the protocol with the highest priority tries to recover first. Other protocols
under the exception do not start to recover until the previous protocol completes the recovery process by
reloading the appropriate FIB table.
ipv4 Prioritizes the IPv4 protocol.
value Priority value; valid values are from 1 to 3.
ipv6 Prioritizes the IPv6 protocol.
mpls Prioritizes the Multiprotocol Label Switching (MPLS) protocol.
Release Modification
12.2(14)SX Support for this command was introduced on the Supervisor Engine 720.
12.2(17a)SX This command was changed to support the ipv6 keyword.
12.2(17b)SXA This command was changed to support the mpls keyword.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.