3com S7906E 설치 설명서

 

1-29 

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Configure the ttl propagate vpn command on all relevant PEs to allow IP TTL propagation of VPN 
packets. 

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Configure the undo ttl expiration pop command on the ASBRs and SPEs to assure that ICMP 
responses can travel along the original LSPs. 

 

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SPE refers to superstratum PE or service provider-end PE. 

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For details about HoVPN, refer to MPLS L3VPN Configuration in the MPLS Volume. 

 

Follow these steps to specify the type of the paths for ICMP responses: 

Enter system view 

— 

Enter MPLS view 

— 

Enable to send ICMP error 
messages when the TTL of an 
MPLS packet expires 

Optional 
Enabled by default. 

Specify that ICMP responses 
travel along the IP route when 
the TTL of an MPLS packet 
expires 

Specify that ICMP responses 
travel along the LSP when the 
TTL of an MPLS packet expires 

Optional 
Configure one of them as 
required. 
By default, ICMP response 
messages of an MPLS packet 
with a one-level label stack 
travel along the IP route. 
ICMP response messages of 
an MPLS packet with multiple 
levels of labels always travel 
along the LSP when the TTL of 
such packet expires. 

 

To view LSP statistics, you need to set the interval for collecting statistics at first. 

Follow these steps to set the interval for collecting statistics: 

Enter system view 

— 

Enter MPLS view 

— 

Set the interval for collecting 
statistics 

 interval-time

Required 
0 seconds by default, meaning 
that the system does not collect 
statistics.