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NE40 cannot Learn OSPF ASE Route of NE16E because of False Application

Publication Date:  2012-07-27 Views:  58 Downloads:  0
Issue Description
Topology: NE40fc---NE16E----NE40ny
The master and slave link of NE16E connect two NE40. NE40ny is main link and teh whole network operates OSPF.NE16E distributes OSPF by imparting static route, but NE40ny cannot learn OSPF external route of NE16E*.*.*.128/26.
Alarm Information
Null
Handling Process
1. When OSPF imparts external route, check ISDB state with dispospflsdbase*.*.*.128. In terms of this case, ISDB state is as follows:
 dispospflsdbase*.*.*.128

LinkStateDataBase
Type:ASE
Lsid:*.*.*.128
Advrtr:*.*.0.16
Lsage:1642
Len:36
Seq#:80000003
Chksum:0xce6a
Options:(NonDC)
Netmask:255.255.255.192
Tos0metric:1
Etype:1
ForwardingAddress:222.174.15.245
Tag:1
Generally, ISDB of ASE route of non-broadcast network in ForwardingAddress is: 0.0.0.0.  There must be intra-area route and inter-domain route to forwardingaddress. It creates detailed route according to ASE. The route to 222.175.15.254 is as follows (not intra-area route or inter-domain route):
dispiprout222.174.15.245
Routingtables:
Summarycount:1
Destination/MaskProtoPreCostNexthopInterface
222.174.0.0/20O_ASE150551222.174.1.93GigabitEthernet3/0/1
There is problem when OSPF imparts static route.
2. Check configuration of static route *.*.*.128/26 at NE16E: The next hop to destination address *.*.*.128/26 is 222.174.15.245 (iproute-static*.*.*.128255.255.255.192222.174.15.245), but 222.174.15.245 is not direct interface address of opposite device of NE16 and learn through ASE. Because of false application, false LSDB forms.
Root Cause
When OSPF imparts external route, it can check ISDB state with dispospflsdbase*.*.*.128.
Generally, ISDB of ASE route of non-broadcast network in ForwardingAddress is: 0.0.0.0.  There must be intra-area route and inter-domain route to forwardingaddress. It creates detailed route according to ASE.
Suggestions
Null

END