[Xorp-users] ospf4 ip-router-alert option

[Michael Fox]

Can someone explain the specific function/behavior of the "ip-router-alert
option" in ospf4?

 

The XORP v1.4 User Manual mentions that setting this to TRUE will put the
IP router alert option in all transmitted packets.  (Since this is an OSPF
configuration parameter, I presume that the documentation really means to
say ".in all transmitted OSPF packets").

 

RFC 2113 (IP Router Alert Option RFC) mentions examples of usage of the
option with RSVP and IGMP.  

 

I can find no mention elsewhere of the use of the IP router alert option
with OSPF and OSPF doesn't seem to need this option.  

 

So, the question is:  what specifically does this option do and under what
circumstances does this option need to be enabled in the OSPF4
configuration?  

 

Thanks,

Michael

 

 

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