3Com MSR 50 Series Configuration Manual page 1439

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Since a local CCC connection is bidirectional, one is enough.
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The PE interfaces connecting the CEs require no IP addresses.
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Network diagram
Figure 399 Network diagram for configuring a local CCC connection
Local CCC connection
S1/0
100 .1.1.1/24
CE 1
Configuration procedure
1 Configure CE 1
<Sysname> system-view
[Sysname] sysname CE1
[CE1] interface serial 1/0
[CE1-Serial1/0] link-protocol ppp
[CE1-Serial1/0] ip address 100.1.1.1 24
2 Configure the PE
# Configure the LSR ID and enable MPLS globally.
<Sysname> system-view
[Sysname] sysname PE
[PE] interface loopback 0
[PE-LoopBack0] ip address 172.1.1.1 32
[PE-LoopBack0] quit
[PE] mpls lsr-id 172.1.1.1
[PE] mpls
[PE-mpls] quit
# Enable MPLS L2VPN globally.
[PE] mpls l2vpn
# Configure interface Serial 1/0.
[PE] interface serial 1/0
[PE-Serial1/0] link-protocol ppp
[PE-Serial1/0] quit
# Configure interface Serial 1/1.
MPLS L2VPN Configuration Example
CE 2
S1/0
100.1.1.2/24
S1/1
S1/0
PE
Loop 0
172 .1.1 .1/32
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