K-values matching is a mandatory condition in EIGRP and not in OSPF.
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Posted 04 August 2009 - 04:29 PM
Posted 05 August 2009 - 12:13 AM
Posted 16 August 2009 - 01:53 AM
Posted 17 August 2009 - 10:48 PM
Posted 30 August 2009 - 06:22 AM
Here are two routers directly connected and one router has a loopback interface defined:
interface Lo 20
ip address 172.16.20.1 255.255.255.0
Then for the OSPF process
router ospf 1
network 172.16.20.0 0.0.0.255 area 0
Why the neighbor router(which also runs OSPF) see the route
O 172.16.20.1/32 [110/1] .... with /32 prefix instead of /24 ?
Posted 30 August 2009 - 06:23 AM
Meanwhile I did some search and here the answer:
Loopbacks are considered host routes in OSPF, and they're advertised as /32. It is all wrote down at section 9.1 of RFC 2328.
Now I have another question on OSPF:
I have an ASBR and I want to redistribute some static routes to other areas this way:
18.104.22.168 I want to redistribute it as an E2 route
the rest of static routes I want to be redistributed as E1 routes.
I tried with a route-map doing this, but no luck until now:
route-map STATIC_32 permit 10
match ip address 25
set metric-type type-2
and then on the OSPF process here's what I get
ASBR(config-router)#redistribute route-map STATIC_32
Unknown routing protocol - "redistribute route-map STATIC_32"
Posted 24 September 2009 - 10:29 PM
Good to know that ppl are diving into concepts rather than braindumping them....awesome...Now for the OSPF neighbor relationships...
Following are the parameters i feel, must match for a neighbor relationship to form in OSPF:-
5) Subnet mask
And remember there's a logical AND between above parameters.....
Posted 25 September 2009 - 01:35 AM
Subnet mask ! Does this means each neighbor has to have the same mask value in order to establish adjacencies? I mean I had a router with 22.214.171.124/16 and 126.96.36.199/24 and couldn't figure it why doesn't work!!
Posted 08 October 2009 - 08:14 PM
Posted 09 October 2009 - 08:08 PM
Posted 22 October 2009 - 03:48 AM
Posted 25 October 2009 - 11:22 PM
my question is how many routes an ospf lsu packet can contain.
Posted 26 October 2009 - 07:06 PM
Posted 26 October 2009 - 07:10 PM
what is the defference between type3 LSA and type 4 LSA
Posted 12 November 2009 - 08:26 PM
Edited by laf_c, 12 November 2009 - 08:29 PM.
Posted 14 November 2009 - 01:57 AM
Me again with a funny OSPF scenario.
R1 R2 R3 R4 all connected through a a central switch. I attached the whole scenario. Here's a resumee:
R1: L0 - 188.8.131.52, E0 - 184.108.40.206
R2: E0 - 220.127.116.11, E1 - 18.104.22.168
R3: L0 - 172.17.1.1, E0 - 22.214.171.124
R4: E0 - 126.96.36.199
Which router will be elected as DR and which one will be elected as BDR?
At first glance I would say R3 as DR and R1 as BDR. The result in lab was ?@$!; OSPF choose R2 as DR and R4 as BDR.
What are your thoughts?
Posted 14 November 2009 - 05:41 AM
I would've thought that it's R4 as DR.
Priorities all defaulted? what about the sequence when they were powered up?
I couldn't open the zipped document.
Edited by DarkFiber, 14 November 2009 - 05:42 AM.
Posted 03 January 2010 - 09:02 PM
Posted 04 January 2010 - 03:55 AM
Thanks for the summary! Had one of my own but it lacked specific technical details which you added and overwhelmed even. Switched to using your.
Posted 04 October 2010 - 05:40 PM
Posted 09 July 2011 - 06:44 AM
Posted 21 October 2012 - 08:44 PM
Posted 13 February 2013 - 02:55 PM
hello darkfiber i am new in cisco and i dont have hands on experience on so pls guide me .i am ccna certified
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