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Ping MPLS

Troubleshooting Ping MPLS

Problem

Description: Before using the ping MPLS tool, make sure that the receiving interface on the VPN or LSP remote endpoint has MPLS enabled, and that the loopback interface on the egress node is configured as 127.0.0.1. The source address for MPLS probes must be a valid address on the J Series device.

Solution

To use the ping MPLS tool:

Procedure

  1. Select Troubleshoot>Ping MPLS in the J-Web user interface if you are using SRX5400, SRX5600, or SRX5800 platform.

    Or

    Select Administration>Ping MPLS in the J-Web user interface.

  2. Click the expand icon next to the ping MPLS option you want to use.
  3. Enter information specified in Table 290 to troubleshoot the issue.
  4. Click Start.
  5. Click OK to stop the ping operation before it is complete.

Table 290: Ping MPLS Troubleshooting Options

Field

Function

Action

Ping RSVP-signaled LSP

LSP Name

Identifies the LSP to ping.

Type the name of the LSP to ping.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J Series device interface.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send. The default is 5 requests.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

Ping LDP-signaled LSP

FEC Prefix

Identifies the LSP to ping.

Type the forwarding equivalence class (FEC) prefix and length of the LSP to ping.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J Series device interface.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send. The default is 5 requests.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

Ping LSP to Layer 3 VPN prefix

Layer 3 VPN Name

Identifies the Layer 3 VPN to ping.

Type the name of the VPN to ping.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send. The default is 5 requests.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

VPN Prefix

Identifies the IP address prefix and length of the Layer 3 VPN to ping.

Type the IP address prefix and length of the VPN to ping.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J Series device interface.

Locate LSP using interface name

Interface

Specifies the interface on which the ping requests are sent.

(See the interface naming conventions in the Junos OS Interfaces Configuration Guide for Security Devices.)

From the list, select the J Series device interface on which ping requests are sent. If you select any, the ping requests are sent on all interfaces.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J series device interface.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send. The default is 5 requests.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

Instance to which this connection belongs

Layer 2VPN Name

Identifies the Layer 2 VPN to ping.

Type the name of the VPN to ping.

Remote Site Identifier

Specifies the remote site identifier of the Layer 2 VPN to ping.

Type the remote site identifier for the VPN.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J Series device interface.

Local Site Identifier

Specifies the local site identifier of the Layer 2 VPN to ping.

Type the local site identifier for the VPN.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send. The default is 5 requests.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

Locate LSP from interface name

Interface

Specifies the interface on which the ping requests are sent.

From the list, select the J Series device interface on which ping requests are sent. If you select any, the ping requests are sent on all interfaces.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J Series device interface.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send. The default is 5 requests.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

Locate LSP from virtual circuit information

Remote Neighbor

Identifies the remote neighbor (PE router) within the virtual circuit to ping.

Type the IP address of the remote neighbor within the virtual circuit.

Circuit Identifier

Specifies the virtual circuit identifier for the Layer 2 circuit to ping.

Type the virtual circuit identifier for the Layer 2 circuit.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J Series device interface.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

Ping endpoint of LSP

VPN Prefix

Identifies the LSP endpoint to ping.

Type either the LDP FEC prefix and length or the RSVP LSP endpoint address for the LSP to ping.

Source Address

Specifies the source address of the ping request packet.

Type the source IP address—a valid address configured on a J Series device interface.

Count

Specifies the number of ping requests to send.

From the list, select the number of ping requests to send.

Detailed Output

Requests the display of extensive rather than brief ping output.

Select the check box to display detailed output.

Ping MPLS Results and Output Summary

Exclamation point (!)

Echo reply was received.

Period (.)

Echo reply was not received within the timeout period.

x

Echo reply was received with an error code. Errored packets are not counted in the received packets count and are accounted for separately.

number packets transmitted

number—Number of ping requests (probes) sent to a host.

number packets received

number—Number of ping responses received from a host.

percentage packet loss

percentage—Number of ping responses divided by the number of ping requests, specified as a percentage.

time

For Layer 2 circuits only, the number of milliseconds required for the ping packet to reach the destination. This value is approximate, because the packet has to reach the Routing Engine.

Output = Packet loss of 100 percent

If the device does not receive ping responses from the destination host (the output shows a packet loss of 100 percent), one of the following explanations might apply:

  • The host is not operational.
  • There are network connectivity problems between the device and the host.
  • The host might be configured to ignore echo requests.
  • The host might be configured with a firewall filter that blocks echo requests or echo responses.
  • The size of the echo request packet exceeds the MTU of a host along the path.
  • The outbound node at the remote endpoint is not configured to handle MPLS packets.
  • The remote endpoint's loopback address is not configured to 127.0.0.1.

See Also

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