Daniel,
With OSPF, if you can spare the addresses, loopbacks are always a good idea.
1) Stub areas do LSAs 1/2 internally, and do NOT get external routes (5)
injected into them. ABR of the stub area will generate 3/4 for its area,
stub or not. .
2) Good question! My guess is if the ASBR is just an ASBR, then it will
not generate a 4 for itself; if it is an ABR, then it will generate a 4 for
itself... I don't have my Thomas Thomas book to verify this, though.
3) that network statement 0.0.0.0 255.255.255.255...whew, look out free
world... I wouldn't use it, personally! Your second choice is better;
personally, I like to use network statements like so: network 1.1.1.1
0.0.0.0 area 11; when I look at my configs, I can see instantly who is
participating in OSPF.
HTH,
Charles
""Daniel Boutet"" <[EMAIL PROTECTED]> wrote in message
8tc7g0$k4e$[EMAIL PROTECTED]">news:8tc7g0$k4e$[EMAIL PROTECTED]...
> Please could anyone confirm these statements:
>
> 1) No AS External LSA (type 5) originate from a stub area
> 2) No ASBR Summary LSA (type 4) originate from router
> if not an ABR router (internal router)
> 3) In the network statement you would use:
>
> router ospf 1
> network 0.0.0.0 255.255.255.255 area 10
> area 10 stub
>
> OSPF would run on all active interface (unless "passive-interface"
> command used on some interface)
>
> Would you still use a loopback address?
>
> interface loopback0
> ip address 192.168.10.1
> router ospf 1
> network 0.0.0.0 255.255.255.255 area 10
> area 10 stub
>
> Wouldn't your "network statement" advertise (more LSA's) your loopback
since
> it "fit"
> inside the all host address? Let's say you have 15 routers inside the stub
> network (this is
> a possibility, right?) would this produce
> unnecessary LSA's by advertising the loopbacks?
> Isn't the purpose of a stub area is to limit LSA?
>
> Or would you rewrite your network statement more restrictive:
>
> interface loopback0
> ip address 192.168.10.1
> router ospf 1
> network 192.168.100.1 0.0.63.255 area 10 (100+ allowed to be
> advertised)
> area 10 stub
>
> Am I understanding the concepts properly about the advertisement?
> Is my wildcard ok in my last network statement? This is how I figure the
> inverse mask:
>
> In short: 192.168. 0110 0100.1 (for readability only use third octet)
> . 0011 1111. (I matched the 0 bit for the
"I
> care"
> and the 1 bit
for
> the "Don't care"
> Thanks
>
> Daniel
>
>
>
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