ping mpls ldp
Syntax
Release Information
Command introduced before Junos OS Release 7.4.
Command introduced in Junos OS Release 9.0 for EX Series switches.
size and sweep options introduced in Junos OS Release 9.6.
instance option introduced in Junos OS Release 10.0.
p2mp, root-address, and lsp-id options introduced in Junos OS Release 11.2.
Statement introduced in Junos OS Release 12.3X50 for the QFX Series.
Description
Check the operability of MPLS LDP-signaled label-switched path (LSP) connections. Type Ctrl+c to interrupt a ping mpls command.
Options
Additional Information
If the LSP changes, the label and interface information displayed when you issued the ping command continues to be used. You must configure MPLS at the [edit protocols mpls] hierarchy level on the remote router or switch to ping an LSP terminating there. You must configure MPLS even if you intend to ping only LDP forwarding equivalence classes (FECs).
You can configure the ping interval for the ping mpls ldp command by specifying a new time in seconds using the lsp-ping-interval statement at the [edit protocols ldp oam] hierarchy level. For more information, see the MPLS Applications User Guide.
In asymmetric MTU scenarios, the echo response may be dropped. For example, if the MTU from System A to System B is 1000 bytes, the MTU from System B to System A is 500 bytes, and the ping request packet size is 1000 bytes, the echo response is dropped because the PAD TLV is included in the echo response, making it too large.
In a Juniper-Cisco interoperation network scenario, a point-to-multipoint LSP ping echo reply message from a Cisco device in a different IGP area is dropped on the Juniper device when the source address of the reply message is an interface address other than the loopback address or router ID. Starting in Junos OS Release 13.3X8, 14.2R6, 15.1R4, 15.1F6, 15.1F5-S8, 16.1R1, and later releases, such point-to-multipoint LSP ping echo reply messages are accepted by the Juniper device and the messages get logged as uncorrelated responses.
Required Privilege Level
network
List of Sample Output
ping mpls ldp fec countping mpls ldp p2mp root-addr lsp-id
Output Fields
When you enter this command, you are provided feedback on the status of your request. An exclamation point (!) indicates that an echo reply was received. A period (.) indicates that an echo reply was not received within the timeout period. An x indicates that an echo reply was received with an error code. Packets with error codes are not counted in the received packets count. They are accounted for separately.
Sample Output
ping mpls ldp fec count
user@host> ping mpls ldp 10.255.245.222 count
10!!!xxx...x--- lsping statistics ---10 packets transmitted, 3 packets received, 70% packet loss 4 packets received with error status, not counted as received.
ping mpls ldp p2mp root-addr lsp-id
user@host>ping mpls ldp p2mp root-addr 10.1.1.1/32
lsp-id 1 count 1Request for seq 1, to interface 71, no label stack.
Request for seq 1, to interface 70, label 299786
Reply for seq 1, egress 10.1.1.3, return code: Egress-ok, time: 18.936 ms
Local transmit time: 2009-01-12 03:50:03 PST 407.281 ms
Remote receive time: 2009-01-12 03:50:03 PST 426.217 ms
Reply for seq 1, egress 10.1.1.4, return code: Egress-ok, time: 18.936 ms
Local transmit time: 2009-01-12 03:50:03 PST 407.281 ms
Remote receive time: 2009-01-12 03:50:03 PST 426.217 ms
Reply for seq 1, egress 10.1.1.5, return code: Egress-ok, time: 18.936 ms
Local transmit time: 2009-01-12 03:50:03 PST 407.281 ms
Remote receive time: 2009-01-12 03:50:03 PST 426.217 ms