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OSPF Neighbor Relation between NE80E and C Corporation's Device cannot be Established

Publication Date:  2012-07-27 Views:  36 Downloads:  0
Issue Description
NE80E and C corporation's router establish OSPF neighbor. The neighbor can only reach loading state.
<JZ_NE80E_1>disp ospf peer 
OSPF Process 1 with Router ID 218.26.134.34 
Neighbors 
Area 0.0.0.0 interface 218.26.125.14(Pos4/0/0)'s neighbors 
Router ID: 218.26.134.2 Address: 218.26.125.13 GR State: Normal 
State: Loading Mode:Nbr is Slave Priority: 1 
DR: None BDR: None MTU: 4470 
Dead timer due in 37 sec 
Neighbor is up for 00:00:00 
Authentication Sequence: [ 0 ] 
Alarm Information
Null
Handling Process
1. Check configuration of two ports and it is no problematic.
2. The problem occurs in the process of LSDB synchronization, check several abnormal LSA with display ospf request-queue command.
3. Turn off the router that creates abnormal LSA and OSPF neighbor reaches full state.
Root Cause
The reason is that NE80E receives abnormal LSA. When NE80E and C corporation's router establish OSPF neighbor, NE80E requests several LSA to C router. LSA that C rotuer sends to NE80 does not match the rule of RFC2328. NE80E refuses and continues to request these LSA. C router still sends these abnormal LSA. The neighbor cannot reach full state.
TOS of abnormal LSA=127, as follows; but the protocol rules TOS=0;
Type-5 AS External Link States
  LS age: 984
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 202.99.205.144 (External Network Number )
  Advertising Router: 202.99.196.217
  LS Seq Number: 80005022
  Checksum: 0xE296
  Length: 36
  Network Mask: /28
Metric Type: 2 (Larger than any link state path)
TOS: 127 
Metric: 16777215 
Forward Address: 0.0.0.0
Suggestions
The protocol realization of different corporations is not the same. Analyze the handling of the problem from different factors.
It needs load the patch, please notice patch list in English website for detailed version.

END