User`s guide

Monitoring and Maintaining OSPF
Matrix DFE Series and N-SA User’s Guide 8-13
Displaying OSPF Information
Fromanyroutermode,usethecommandslistedinTable 8‐5todisplayOSPFinformation.
Limiting Database Overflow
OSPFlinkstatedatabaseoverflowoccurswhentherouterisunabletomaintainthedatabaseinits
entiretyduetoexcessiveexternalLSAs.Settingdatabaseoverflowallowsyoutolimitthenumber
ofexternalLSAs.Ifthelimitisexceeded,self‐originatedexternalLSAswillberemovedsothat 
OSPFcan
handlethelargenumberofexternalLSAscomingfromanotherrouter.Whenthe
warninglevelisset,aSyslogmessagewillbeissuedwhenthenumberofexternalLSAshas
reachedthespecifiedlevel.Afterthespecified
exit-overflow-interval isreached,thedatabasewill
becheckedand,iftheLSAtotalislessthanthelimitspecified,theselforiginatedexternalLSAs
willberestored.
FromOSPFconfigurationmode,usethefollowingcommandtolimitOSPFdatabaseoverflow:
database-overflow external {[exit-overflow-interval interval] [limit limit]
[warning-level level]}
Exit‐overflow‐interval specifiesaninterval(inseconds)theOSPFlinkstatedatabasewillbe
checkedtodetermineiftheoverflowlimithasbeenreached.Validvaluesare0‐86400.
Defaultis0.
LimitspecifiesthepeaknumberofLSAsacceptedbeforeoverflowoccurs.Validvaluesare0‐
4000.Defaultis0.
Limitvaluemustbegreaterthanthewarning‐levelvalueandsetpriortoit
sincealldefaultsare0.
Warning‐levelspecif iesthenumberofLSAsatwhichawarningofpendingoverflowwillbe
generated.Validvaluesare 0‐4000.Defaultis0.
Table 8-5 Displaying OSPF Information
Command Output
show ip ospf OSPF instance information, including area,
interfaces, and global parameters.
show ip ospf border-routers Information about Autonomous System (AS) and
Area Border Routers (ABRs).
show ip ospf database [database-
summary] | [router | network |
summary | asbr-summary | external |
nssa-external [link-state-id]
One or all link state database records, a numerical
summary of the LSDB contents, or only record(s)
related to a specific link state type and/or link state
ID.
show ip ospf interface [vlan vlan-id] Interface related information, including network type,
priority, cost, hello interval, and dead interval, for
one or all routing VLANs.
show ip ospf neighbor
[detail][ip-
address] [vlan vlan-id]
Detailed or summary information about OSPF
routing neighbors assigned to one or all IP
addresses and/or VLANs.
show ip ospf virtual-links All OSPF virtual links.