From: Brian Dennis (brian@labforge.com)
Date: Thu Mar 06 2003 - 15:32:45 GMT-3
Well putting my CCIE lab thinking cap on ;-) the task states "don't
configure network type broadcast or non-broadcast" but the default will
be non-broadcast since we are using physical interfaces and multipoint
subinterfaces. Here are my preferred solutions in order of preference.
1) All interfaces point-to-multipoint. Note: Creates /32 host routes for
the end points but doesn't need frame-relay mappings between the spokes.
2) Point-to-multipoint on R1 and point-to-point on R2 and R3. The
hello/dead timers need to be set on R1 or R2/R3 to match. Note: Creates
/32 host route for only R1 so frame-relay mappings would be needed
between the spokes.
3) Unicast neighbors on R1 and set the OSPF priority to "0" on R2 and
R3. But first I would clarify with the proctor the wording of the "don't
configure" part of the task and ensure "don't configure network type
non-broadcast" doesn't also mean "don't use non-broadcast network type"
(you've got to love the CCIE lab ;-) If the wording means "don't
configure network type non-broadcast" then this solution is okay but if
the wording means "don't use network type non-broadcast" then I would
scrap this solution. Note: Frame-relay mappings would be needed between
the spokes.
Brian Dennis, CCIE #2210 (R&S/ISP Dial/Security)
brian@labforge.com
http://www.labforge.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scot Peter
Sent: Thursday, March 06, 2003 8:39 AM
To: ccielab@groupstudy.com
Subject: A question on OSPF for NBMA Networks
Hi Group,
If we need to configure OSPF on a Multipoint interface with the
following condition,
- R1 should use Multipoint interfaces,
- R2, R3 should not use subinterfaces,
- All three routers should be in the same Network.
- Don't configure Network type Broadcast or non-broadcast.
R1
/ \
R2 R3
I am not sure about configuring "ip ospf network
point-to-multipoint" (as it is mentioned not to configure
non-broadcast) or do we need to configure using "neighbor"
command? Please advice me on this.
Thanks
Peter
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