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Old 07-31-2013, 12:01 PM   #1
jzoudavy
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OSPFv3 question regarding the "E" bit in the bitmask option


Hi guys

I got these two ethernet interfaces and I am trying to get them to do OSPFv3.

eth1 is on a linux blade cluster (LBC), eth2 is on the quagga rotuer.

Their OSPFv3 is not working because the LBC doesn't like the fact that the Quagga router is sending OSPFv3 with the E bit set to 1.

So I have two options,
1) I can either set the LBC's E to 1
or
2) set the Quagga router's E bit to 0.

1) I am currently stuck on because such detailed settings are not easily user configurable. And LC experts in Spain is done for the day. (yes, i am that impatient. )

2) Quagga router documentation doesn't contain this bitmask info.

so my question is two fold:
1) what is the E bit?
2) on Quagga, how do I change it? just throw me your suggestions please.

thanks guys

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Old 07-31-2013, 12:31 PM   #2
Ser Olmy
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According to section 4.2.1.1 of RFC 5340, the E-bit "is set if and only if the interface attaches to a regular area, i.e., not a stub or NSSA area".

Section 2.3 says the following about flooding scope: "A router that originates AS scoped LSAs is considered an AS Boundary Router (ASBR) and will set its E-bit in router-LSAs for regular areas".

In other words, the E-bit is set or cleared depending on the area definition. It would seem that the LBC believes it is attached to a stub area or NSSA, while Quagga thinks it's a regular area. Changing the relevant parameters at either end should resolve the issue.
 
Old 07-31-2013, 12:38 PM   #3
jzoudavy
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so E is regular and no E is stub?
 
Old 07-31-2013, 12:43 PM   #4
Ser Olmy
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According to the RFC, yes.
 
Old 07-31-2013, 06:49 PM   #5
jzoudavy
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just to wrap this up something is not right with the LBC and the Quagga. I ended up using another node.

thanks for your help
 
  


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