3com S7906E Guide De Référence

 

1-50 

Use the undo ttl expiration pop command to specify that ICMP responses travel along the LSP when 

the TTL of an MPLS packet expires. 

By default, ICMP responses of an MPLS packet with a one-level label stack travel along the IP route. 

Note that configuring the undo mpls command will remove the configurations of the ttl expiration pop 

command. 

Related commands: ttl propagate. 

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

<Sysname> system-view 

[Sysname] mpls 

[Sysname-mpls] undo ttl expiration pop 

ttl propagate { public | vpn } 

undo ttl propagate { public | vpn } 

MPLS view 

2: System level 

public: Specifies public network packets. 

vpn: Specifies VPN packets. 

Use the ttl propagate command to enable MPLS IP TTL propagation for public network packets or VPN 

packets. 

Use the undo ttl propagate command to disable the function. 

By default, MPLS IP TTL propagation is enabled for only public network packets. 

Related commands: ttl expiration pop. 

# Enable MPLS IP TTL propagation for VPN packets. 

<Sysname> system-view 

[Sysname] mpls 

[Sysname-mpls] ttl propagate vpn