R0106-HP MSR Router Series MPLS Configuration Guide(V7)

9
Ste
p
Command Remarks
2. Enable TTL propagation.
mpls ttl propagate { public |
vpn }
By default, TTL propagation is enabled only
for public-network packets.
This command affects only the propagation
between IP TTL and label TTL. Within an
MPLS network, TTL is always copied between
the labels of an MPLS packet.
Enabling sending of MPLS TTL-expired messages
This feature enables an LSR to generate an ICMP TTL-expired message upon receiving an MPLS packet
with a TTL of 1. If the MPLS packet has only one label, the LSR sends the ICMP TTL-expired message back
to the source through IP routing. If the MPLS packet has multiple labels, the LSR sends it along the LSP to
the egress, which then sends the message back to the source.
To enable sending of MPLS TTL-expired messages:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enable sending of MPLS TTL-expired
messages.
mpls ttl expiration enable By default, this function is enabled.
Enabling MPLS forwarding statistics
Enabling FTN forwarding statistics
FEC-to-NHLFE map (FTN) entries are FIB entries that contain outgoing labels used for FTN forwarding.
When an LSR receives an unlabeled packet, it searches for the corresponding FTN entry based on the
destination IP address. If a match is found, the LSR adds the outgoing label in the FTN entry to the packet
and forwards the labeled packet.
To enable FTN forwarding statistics:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter RIB view.
rib
N/A
3. Create a RIB IPv4 address
family and enter RIB IPv4
address family view.
address-family ipv4
By default, no RIB IPv4 address
family is created.
4. Enable the device to maintain
FTN entries in the RIB.
ftn enable
By default, the device does not
maintain FTN entries in the RIB.
5. Enable FTN forwarding
statistics for a destination
network.
mpls-forwarding statistics prefix-list
prefix-list-name
By default, FTN forwarding
statistics is disabled for all
destination networks.