Specifications

trace mpls
MP-830
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Command Modes Privileged EXEC (#)
revision {1 | 2 | 3 | 4} (Optional) Selects the type, length, values (TLVs) version of the
im
plementation. Use the revision 4 defa
ult unless attempting to interoperate
with devices running Cisco IOS Release 12.0(27)S1 or 12.0(27)S2. If you do
n
ot select a revision keyword, the software uses the latest version.
See Ta
ble 164 in the“Revision Keyword Usage” section of the “Usage
Guidelines” section for information on when to select the 1, 2, 3, an
d 4
keywords.
source sour
ce-address (Optional) Specifies the source address or name. The default address is
loopback0. This address is used as the destination address in the MPLS echo
response.
exp ex
p-bits (Optional) Specifies the MPLS experimental field value in the MPLS header
for an MPLS echo reply. Valid values are from 0 to 7. Default is 0.
ttl
ma
ximum-time-to-live
(Optional) Specifies a maximum hop count. Default is 30.
reply dscp d
scp-bits (Optional) Provides the capability to request a specific class of service (CoS)
in an echo reply by providing a differentiated services code point (DSCP)
value.
The echo reply is returned with the IP header ToS byte set to the value
s
pecified in the reply dscp keyword.
reply mode re
ply-mode (Optional) Specifies the reply mode for the echo request packet.
The re
ply-mode is one of the following:
ipv4—R
eply with an IPv4 User Datagram Protocol (UDP) packet (default).
no-reply—
Do not send an echo request packet in response.
router-alert—R
eply with an IPv4 UDP packet with router alert.
reply pad-tlv (Optional) Tests the ability of the sender of an echo reply to support the copy
pa
d TLV to echo reply.
force-explicit-null (Optional) Forces an explicit null label to be added to the MPLS label stack
e
ven though the label was unsolicited.
output interface
tx-
interface
(Optional) Specifies the output interface for echo requests.
nexthop ip
-address (Optional) Causes packets to go through the specified next-hop address.
flags fec (Optional) Requests that target Forwarding Equivalence Class (FEC) stack
v
alidation be done at the egress router. A downstream map TLV containing
the correct received labels must be present in the echo request for target FEC
stack checking to be performed.
Be sure to use this keyword in conjunction with the tt
l keyword.
revision
t
lv-revision-number
(Optional) Cisco TLV revision number.