Specifications

echo
MP-58
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
echo
To customize the default behavior of echo packets, use the echo command in MPLS OAM configuration
mode. To set the echo packet’s behavior to its default value, use the no form of this command.
echo {r
evision {3 | 4} | vendor-extension}
no echo {r
evision {3 | 4} | vendor-extension}
Syntax Description
Command Default Cisco-specific extension TLVs are sent with the echo packet. Revision 4 is the router’s default.
Command Modes MPLS OAM configuration
Command History
Usage Guidelines Before you can enter the ec
ho command, you must first enter the mpls oam command to enter MPLS
OAM configuration mode.
Specify the rev
ision keyword only if one of the following conditions exists:
• You want to change the revision number from the default of revision 4 to revision 3.
• You previously entered the mpls oam command and changed the revision number to 3 and now you
want to change the revision back to 4.
To prevent failures reported by the replying router due to TLV version issues, you can use the ec
ho
revision command to configure all routers in the core for the same version of the Internet Engineering
Task Force (IEFT) label switched paths (LSP) ping draft. For example, if the network is running draft
RFC 4379 implementations, but one router is capable of only Version 3 (Cisco Revision 3), configure all
revision Specifies the revision number of the echo packet’s default values. Valid
v
alues are:
• 3—draft-ietf-mpls-lsp-ping-03 (Revision 2)
• 4—RFC 4379 compliant (default)
vendor-extension Sends Cisco-specific extension of type, length, values (TLVs) with echo
pa
ckets.
Release Modification
12.4(6)T This command was introduced.
12.0(32)SY This command was integrated into Cisco IOS Release 12.0(32)SY.
12.4(11)T This command was integrated into Cisco IOS Release 12.4(11)T.
12.2(31)SB2 This command was integrated into Cisco IOS Release 12.2(31)SB2.
12.2(33)SRB This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.0(33)S This command was integrated into Cisco IOS Release 12.0(33)S.
12.4(20)T This command was integrated into Cisco IOS Release 12.4(20)T.
12.2(33)SXI This command was integrated into Cisco IOS Release 12.2(33)SXI.