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 . (I matched the 0 bit for the
"I
care"
and the 1 bit
for
the "Don't care"
Thanks
Daniel
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