Cisco ? OSPF: Frequently Asked Questions---new
OSPF: Frequently Asked Questions
Why are loopbacks advertised as /32 host routes in OSPF? ·
How do I change the reference bandwidth in OSPF? ·
How does OSPF calculate its metric or cost? ·
Are OSPF routing protocol exchanges authenticated? ·
What is the link?state retransmit interval, and what is the command to set it? ·
What is the purpose of the variable IP?OPSF?Transmit?Delay? ·
Is it true that only the static option of the virtual link in OSPF allows discontiguous networks,
regardless of the mask propagation properties?
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Are the multicast IP addresses mapped to MAC?level multicast addresses? ·
Does the Cisco OSPF implementation support IP TOS?based routing? ·
Will the offset?list subcommand work for OSPF? ·
Can an OSPF default be originated into the system based on external information on a router that does
not itself have a default?
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Can I use the distribute?list in/out command with OSPF to filter routes? ·
How can I give preference to OSPF inter?area routes over intra?area routes? ·
Do we have to manually setup adjacencies for routers on the SMDS cloud with the OSPF neighbor
subcommand?
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When routes are redistributed between OSPF processes, are all SPF metrics preserved or is the default
metric value used?
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How does Cisco accommodate OSPF routing on partial?mesh Frame Relay networks? ·
Which address?wildmask pair should I use for assigning an unnumbered interface to an area? ·
Can I have one numbered side and leave the other side unnumbered in OSPF? ·
Why do I receive the "cannot allocate router id" error message when I configure Router OSPF One? ·
Why do I receive the "unknown routing protocol" error message when I configure Router OSPF One? ·
What do the states DR, BDR, and DR/OTHER mean in show is ospf interface output? ·
When I type the show ip ospf neighbor command, why do I only see FULL/DR and FULL/BDR, with
all other neighbors showing 2?WAY/DROTHER?
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Why don't I see OSPF neighbors as FULL/DR or FULL/BDR on my serial link? ·
Do I need any special commands to run OSPF over BRI/PRI links? ·
Do I need any special commands to run OSPF over asynchronous links? ·
Which Cisco IOS version began support for per?interface authentication type in OSPF? ·
Can I control the P?bit when importing external routes into an NSSA? ·
Why are OSPF show commands responding so slowly? ·
What does the clear ip ospf redistribution command do? ·
Will OSPF form adjacencies with neighbors that are not on the same subnet? ·
How often will OSPF send out LSAs? ·
Related Information ·
Q: Why are loopbacks advertised as /32 host routes in OSPF?
A: Loopbacks are considered host routes in OSPF, and they're advertised as /32. For more
information, see section 9.1 of RFC 2328. In Cisco IOS
