Restarting Mpls Ldp; Gracefully Restarting Mpls Ldp; Configuring Mpls Ip Ttl Processing; Configuration Prerequisites - 3Com MSR 50 Series Configuration Manual

1334 C 76: MPLS B
HAPTER

Restarting MPLS LDP

Gracefully Restarting
MPLS LDP
Configuring MPLS IP
TTL Processing
Configuration
Prerequisites
Configuring MPLS IP TTL
Propagation
Specifying the Type of
Path for ICMP Responses
C
ASICS ONFIGURATION
After configuring GR parameters, you need to restart MPLS LDP to validate the
configurations.
Follow these steps to reset MPLS LDP:
To do...
Reset MPLS LDP
To test MPLS LDP GR without main/backup failover, you can gracefully restart
MPLS LDP. You are not recommended to perform this operation in normal cases.
Follow these steps to gracefully restart MPLS LDP:
To do...
Gracefully restart MPLS LDP
Before configuring MPLS IP TTL propagation, be sure to complete this task:
Configuring MPLS basic capability
■
Follow these steps to configure IP TTL propagation of MPLS:
To do...
Enter system view
Enter MPLS view
Enable MPLS IP TTL
propagation for either public
network packets or VPN
packets
c
CAUTION:
The ttl propagate command affects only the propagation of the IP TTL to the
■
MPLS label. At the egress, the system uses the smaller one between the IP TTL
and MPLS TTL as the TTL of the IP packet and decrements the value by 1.
If you want to enable MPLS IP TTL propagation for VPN packets on one LSR,
■
you are recommended to do so on related PEs, guaranteeing that you can get
the same result when tracerting from those PEs.
ICMP responses can use two kinds of paths: IP route and LSP.
For MPLS packets with one-level labels, you can configure MPLS to send back
ICMP responses along IP routes instead of LSPs when the TTL expires.
Use the command...
reset mpls ldp [ all | [ vpn-instance
vpn-instance-name ] [ fec mask | peer
peer-id ] ]
Use the command...
graceful-restart mpls ldp
Use the command...
system-view
mpls
ttl propagate { public | vpn } Optional
Remarks
Required
Available in user view
Remarks
Required
Available in user view
Remarks
-
Required
Enabled for only public
network packets by default