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DES-7200 Configuration Guide Chapter 1 MPLS Configuration
1-36
Since LER_B is the PHP LSR for the FEC 192.168.100.0/24, the incoming label 17 is mapped to
the outgoing label 3 (implicit null label). The outgoing interface is GigabitEthernet 2/1.
Similarly, since LER_B is the PHP LSR for the FEC 192.168.200.0/24, the incoming label 16 is
also mapped to the outgoing label 3 (implicit null label). The outgoing interface is GigabitEthernet
2/2.
Configurations on LER_C:
Command Function
DES-7200 (config)# interface
gigabitEthernet 2/1
Enter the interface mode of GigabitEthernet 2/1.
DES-7200(config-if-GigabitEthernet
2/1)# label-switching
Enable MPLS on the interface at the public network
side.
DES-7200(config-if-GigabitEthernet
2/1)# exit
Quit the interface mode and enter the global
configuration mode.
DES-7200 (config)# mpls static ftn
192.168.100.0/24 out-label 17
nexthop gigabitEthernet 2/1
192.168.2.1
Create an FTN that binds 192.168.200.0/24 to label
16, specify the next hop of the FTN as 192.168.1.2
and the outgoing interface as GigabitEthernet 2/2.
DES-7200 (config-router)# end
End
After the preceding configurations, the packets destined for the 192.168.200.0/24 network
segment on LER_A are sent out by GigabitEthernet 2/2 on LER_A and pushed with label 16.
After arrival at the GigabitEthernet 2/1 interface on LER_B, the packets with label 16 are then
transformed to IP packets and sent out by GigabitEthernet 2/2 on LER_B. After the IP packets
destined for the 192.168.200.0/24 network segment arrives at LER_C, LER_C selects routes
based on the destination IP addresses and sends out the packets from GigabitEthernet 2/1.