Customer wants to connect a new link between Huawei NE80 and JM320 router using STM-1 fiber link. The line protocol is always down.
We have to modify the configurations of pos interface as follows:-
flag j0 sonet 1
flag c2 207
description "Connected to Transworld (International Exit)"
ip address 220.127.116.11 255.255.255.252
Physical interface: so-1/0/3, Enabled, Physical link is Up
Interface index: 140, SNMP ifIndex: 178
Link-level type: PPP, MTU: 4474, Clocking: Internal, SONET mode, Speed: OC3, Loopback: None, FCS: 16,
Payload scrambler: Enabled
Device flags : Present Running
Interface flags: Point-To-Point SNMP-Traps Internal: 0x4000
LCP state: Down
NCP state: inet: Not-configured, inet6: Not-configured, iso: Not-configured, mpls: Not-configured
CHAP state: Closed
CoS queues : 8 supported, 4 maximum usable queues
Last flapped : 2007-06-27 14:35:09 UTC (00:09:33 ago)
Input rate : 0 bps (0 pps)
Output rate : 72 bps (0 pps)
SONET alarms : None
SONET defects : None
Logical interface so-1/0/3.0 (Index 80) (SNMP ifIndex 37)
Flags: Hardware-Down Point-To-Point SNMP-Traps Encapsulation: PPP
Protocol inet, MTU: 4470
Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
Destination: 18.104.22.168/30, Local: 22.214.171.124, Broadcast: 126.96.36.199
The configurations of flag c2 207 and j0 1 are done after getting the configurations of J-M320. But still the link protocol does not go UP because there is a parameter mismatch as that of FCS (Frame check sequence). We did not have any option in Huawei to configure FCS in pos interface but in J-M320 we can change FCS value to 16 or 32. Huawei NE80 negotiate with J-M320 on FCS=32.
After this modification on J-M320 the link protocol is UP and problem is resolved.
We have checked many parameters and found that there are some parematers which are different bydefault in both Huawei and J-router. We need to change some paremeters of SONET to enable the link protocol UP.