From: Lee Donald (Lee.Donald@t-systems.co.uk)
Date: Thu Jul 21 2005 - 09:56:12 GMT-3
Hi Group,
I failed for the 2nd time yesterday in Brussels after a mammoth effort of
studying and courses etc.
When I walked out the door I was fairly sure I'd passed (which makes it even
worse) but what I can't understand is their marking, probably won't ever
understand it.
Certain sections like my BGP were spot on and running like a brand new BMW (
so I thought) they even gave you screen outputs of what your "show ip bgp "
should look like, well mine looked like that but I got 39%.
I don't know whether their testing you to see if you know and can configure
the technology, or trying to trip you up with Cryptic questions that are
designed to mislead you.
Any Comments, sorry having a Hate Cisco day.
Regards
Lee.
-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: 21 July 2005 12:48
To: 'Shanky'; 'Group Study'
Subject: RE: OSPF: Remember old DR 2.1.1.10 (id) ... why ?
Shanky,
I don't know if this answers your question directly but I can tell you this.
Ospf doesn't use preemption in the election of the DR and BDR. Because of
this ospf is more stable on a broadcast segment. Once a DR is elected, that
router will remain as the DR even if another router on the same segment
comes on line with a higher priority.
This being the case, I guess that its necessary for a non-Dr and non-BDR
router to remember who the DR and BDR were if it were to go down so that
when it comes back up it knows with which routers to re-establish
adjacencies with.
As far as the lab goes, I don't think this detail is that important. What's
really important is that you're aware of this non-preempt behavior so that
when you configure ospf on a broadcast or nbma segment, you know to set the
priority to 0 on routers which should not become the DR or BDR before
bringing the router up on the segment.
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Shanky
Sent: Thursday, July 21, 2005 1:20 AM
To: Group Study
Subject: OSPF: Remember old DR 2.1.1.10 (id) ... why ?
Hi,
I got the foll output with debug ip ospf adj when I shut the serial to FR
switch down on the spoke in NBMA mode. Why does the router remember who the
old DR was as shown in the output ? I mean, once new DR is selected, even if
the old DR comes back online (Say after a crash), it doesnt affect.
**Mar 1 16:15:15.799: OSPF: Remember old DR 2.1.1.10 <http://2.1.1.10> (id)
... why does the router remember the old DR?*
*Mar 1 16:15:15.795: OSPF: Interface Serial0/0 going Down
*Mar 1 16:15:15.795: OSPF: 1.1.1.1 <http://1.1.1.1> address
1.1.1.1<http://1.1.1.1>on Serial0/0 is dead, state
DOWN
*Mar 1 16:15:15.795: OSPF: Neighbor change Event on interface Serial0/0
*Mar 1 16:15:15.795: OSPF: DR/BDR election on Serial0/0
*Mar 1 16:15:15.795: OSPF: Elect BDR 0.0.0.0 <http://0.0.0.0>
*Mar 1 16:15:15.795: OSPF: Elect DR 2.1.1.10 <http://2.1.1.10>
*Mar 1 16:15:15.795: OSPF: Elect BDR 0.0.0.0 <http://0.0.0.0>
*Mar 1 16:15:15.795: OSPF: Elect DR 2.1.1.10 <http://2.1.1.10>
*Mar 1 16:15:15.799: DR: 2.1.1.10 <http://2.1.1.10> (Id) BDR: none
*Mar 1 16:15:15.799: OSPF: 2.1.1.10 <http://2.1.1.10> address
1.1.1.2<http://1.1.1.2>on Serial0/0 is dead, state
DOWN
*Mar 1 16:15:15.799: %OSPF-5-ADJCHG: Process 1, Nbr
2.1.1.10<http://2.1.1.10>on Serial0/0 from
FULL to DOWN, Neighbor Down: Interface down or detached
*Mar 1 16:15:15.799: OSPF: Neighbor change Event on interface Serial0/0
*Mar 1 16:15:15.799: OSPF: DR/BDR election on Serial0/0
*Mar 1 16:15:15.799: OSPF: Elect BDR 0.0.0.0 <http://0.0.0.0>
*Mar 1 16:15:15.799: OSPF: Elect DR 0.0.0.0 <http://0.0.0.0>
*Mar 1 16:15:15.799: DR: none BDR: none
**Mar 1 16:15:15.799: OSPF: Remember old DR 2.1.1.10 <http://2.1.1.10> (id)*
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