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Ratheesh mv
Beginner

L2 VPN ping

HI friends , ping mpls pseudowire 10.10.10.10 1010 reply mode ? control-channel Send reply via a control channel ipv4 Send reply via IPv4 no-reply Send no reply router-alert Send reply via IPv4 UDP with router alert Could anyone explain the difference between these ? Some times when I use IPV4 able to ping however if I use control-channel not able to ping. If anyone share at least  material it would be appreciated. Thanks  
1 ACCEPTED SOLUTION

Accepted Solutions
pman
Beginner

Hi,

 

I hope this will help you understand the meaning of the commands:

 

LSP Ping
MPLS LSP ping uses MPLS echo request and reply packets, similar to Internet Control Message Protocol
(ICMP) echo request and reply messages, to validate an LSP. ICMP echo request and reply messages validate
IP networks; MPLS OAM echo and reply messages validate MPLS LDP networks. The LSP ping and trace
functions use IPv4 UDP packets with UDP port number 3503. You can use MPLS LSP ping to validate IPv4
LDP or Forwarding Equivalence Classes (FECs) by using the ping mpls privileged EXEC command. The
MPLS echo request packet is sent to a target router by using the label stack associated with the FEC to be
validated.

 

resources:

https://www.cisco.com/c/en/us/td/docs/wireless/asr_901/Configuration/Guide/b_asr901-scg/b_asr901-scg_chapter_010001.pdf

 

 

reply mode [ ipv4 | router-alert | no-reply ]

Specifies the reply mode for the echo request packet. no-reply

Do not reply

ipv4

Reply with an IPv4 UDP packet (this is the default)
router-alert

Reply with an IPv4 UDP packet with the IP router alert set

 

resources:

https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/mpls/b-mpls-cr-ncs5500/b-ncs5500-mpls-cli-reference_chapter_0110.html

 

Return code 4 sent due to some error condition either of the following has occurred:

 - Wrong VC ID
 - Wrong VC Type
 - Wrong Source Address

 

resources (page 63):

https://archive.nanog.org/meetings/nanog33/presentations/moizuddin.pdf

 

 

reply mode control-channel

this pings the PW part only from one tunnel end point to the other and does not touch to the AC part of the circuit

View solution in original post

1 REPLY 1
pman
Beginner

Hi,

 

I hope this will help you understand the meaning of the commands:

 

LSP Ping
MPLS LSP ping uses MPLS echo request and reply packets, similar to Internet Control Message Protocol
(ICMP) echo request and reply messages, to validate an LSP. ICMP echo request and reply messages validate
IP networks; MPLS OAM echo and reply messages validate MPLS LDP networks. The LSP ping and trace
functions use IPv4 UDP packets with UDP port number 3503. You can use MPLS LSP ping to validate IPv4
LDP or Forwarding Equivalence Classes (FECs) by using the ping mpls privileged EXEC command. The
MPLS echo request packet is sent to a target router by using the label stack associated with the FEC to be
validated.

 

resources:

https://www.cisco.com/c/en/us/td/docs/wireless/asr_901/Configuration/Guide/b_asr901-scg/b_asr901-scg_chapter_010001.pdf

 

 

reply mode [ ipv4 | router-alert | no-reply ]

Specifies the reply mode for the echo request packet. no-reply

Do not reply

ipv4

Reply with an IPv4 UDP packet (this is the default)
router-alert

Reply with an IPv4 UDP packet with the IP router alert set

 

resources:

https://www.cisco.com/c/en/us/td/docs/iosxr/ncs5500/mpls/b-mpls-cr-ncs5500/b-ncs5500-mpls-cli-reference_chapter_0110.html

 

Return code 4 sent due to some error condition either of the following has occurred:

 - Wrong VC ID
 - Wrong VC Type
 - Wrong Source Address

 

resources (page 63):

https://archive.nanog.org/meetings/nanog33/presentations/moizuddin.pdf

 

 

reply mode control-channel

this pings the PW part only from one tunnel end point to the other and does not touch to the AC part of the circuit

View solution in original post