Specifications

trace mpls multipath
MP-837
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Command Default timeout = 2 seconds
interval =
0 milliseconds
reply mode = IP
v4 via UDP (2)
Maximum time-to-live = 30 hops
Experimental bits in MPLS header = 0
Command Modes Privileged EXEC (#)
Command History
Usage Guidelines Use the t
race mpls multipath command to discover all possible paths between an egress and ingress
router in multivendor networks that use IPv4 load balancing at the transit routers.
Use the dest
ination address-start address-end keyword and arguments to specify a valid 127/8 address.
You have the option to specify a single x.y.z-address or a range of numbers from 0.0.0 to x.y.z, where x,
y, and z are numbers from 0 to 255 and correspond to the 127.x.y.z destination address. The MPLS echo
reply dscp dsc
p-value (Optional) Controls the differentiated services codepoint (DSCP) value of
an echo reply. Allows the support of a class of service (CoS) in an echo
reply.
retry-count
ret
ry-count-value
(Optional) Sets the number of timeout retry attempts during a multipath
LSP trace. A retry is attempted if an outstanding echo request times out
waiting for the corresponding echo reply.
A ret
ry-count-value of 0 means infinite retries. Valid values are from
0 to 10.
force-explicit-null (Optional) Forces an explicit null label to be added to the MPLS label
st
ack even though the label was unsolicited.
output interface
tx-
interface
(Optional) Specifies the output interface for MPLS echo requests.
nexthop ip
-address (Optional) Causes packets to go through the specified next hop address.
hashkey ipv4 bitmap
bi
tmap-size
(Optional) Allows you to control the hash key and multipath settings.
• ipv4—Indicates an IPv4 address, which is the only hashkey type valid
for multipath (type 8).
• bitmap bitmap-size—Size of the bitmap IPv4 addresses.
flags fec (Optional) Requests that target Forwarding Equivalence Class (FEC) stack
v
alidation of a transit router be done at the egress router.
Note Be sure to use the flags fec keywords in conjunction with the ttl
keyword.
verbose (Optional) Displays the MPLS echo reply sender address of the packet and
d
isplays return codes.
Release Modification
12.2(31)SB2 This command was introduced.
12.2(33)SRB This command was integrated into Cisco IOS Release 12.2(33)SRB.
12.4(20)T This command was integrated into Cisco IOS Release 12.4(20)T.