From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Fri Dec 19 2003 - 18:24:01 GMT-3
Jonathan,
That's a possibility too. Since there is no DR/BDR their router-ids
are 0.0.0.0. I'd bet more on you overanalyzing the question that the author
of the question intending this though ;) Where is the question from?
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 708-362-1418 (Outside the US and Canada)
> -----Original Message-----
> From: Jonathan Hays [mailto:nomad@gfoyle.org]
> Sent: Friday, December 19, 2003 3:14 PM
> To: 'Brian McGahan'; ccielab@groupstudy.com
> Subject: RE: OSPF ID of 0.0.0.0
>
> you wrote:
> Jonathan,
>
> The question is probably asking you to put the routers in OSPF area 0.
> [snip]
> = = =
>
> Brian
>
> I think I have found another possible solution. Look at the output below
> when I change the default network type with the command "ip ospf network
> point-to-multipoint".
>
> R2#show ip ospf neighbor detail | include DR
> DR is 0.0.0.0 BDR is 0.0.0.0
> R2#
>
> Since there were no constraints on the interface type in this problem, I
> suspect they were hinting that you should change the network type. And
> since point-to-multipoint doesn't use DR or BDR, the output of the "show
> ip ospf neighbor detail" tags them both as 0.0.0.0, which meet the "DR
> _and_ BDR" constraint of the problem statement.
>
> What do you think?
>
> See details below.
>
> Jonathan
>
>
> ===============================
> OSPF network type nonbroadcast
> ===============================
> R5#sh run int s1/0.100
> Building configuration...
>
> Current configuration : 242 bytes
> !
> interface Serial1/0.100 multipoint
> ip address 139.10.100.5 255.255.255.224
> frame-relay map ip 139.10.100.2 502 broadcast
> frame-relay map ip 139.10.100.4 504 broadcast
> frame-relay map ip 139.10.100.5 502
> no frame-relay inverse-arp
> end
>
> R5#sh ip ospf neighbor detail
> Neighbor 139.10.2.2, interface address 139.10.100.2
> In the area 0.0.0.0 via interface Serial1/0.100
> Neighbor priority is 0, State is FULL, 8 state changes
> DR is 139.10.100.5 BDR is 0.0.0.0
> Poll interval 120
> Options is 0x42
> Dead timer due in 00:01:45
> Neighbor is up for 00:10:14
> Index 1/1, retransmission queue length 0, number of retransmission 1
> First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
> Last retransmission scan length is 1, maximum is 1
> Last retransmission scan time is 0 msec, maximum is 0 msec
> R5#
> TermServer>2
> [Resuming connection 2 to r6_2620 ... ]
> [OK]
> R2#
> R2#sh run int s0/0
> Building configuration...
>
> Current configuration : 289 bytes
> !
> interface Serial0/0
> ip address 139.10.100.2 255.255.255.224
> encapsulation frame-relay
> ip ospf priority 0
> no fair-queue
> frame-relay map ip 139.10.100.2 205
> frame-relay map ip 139.10.100.4 205 broadcast
> frame-relay map ip 139.10.100.5 205 broadcast
> no frame-relay inverse-arp
> end
>
> R2#sh ip ospf nei detail
> Neighbor 139.10.5.5, interface address 139.10.100.5
> In the area 0.0.0.0 via interface Serial0/0
> Neighbor priority is 1, State is FULL, 6 state changes
> DR is 139.10.100.5 BDR is 0.0.0.0
> Poll interval 120
> Options is 0x42
> Dead timer due in 00:01:36
> Neighbor is up for 00:08:53
> Index 1/1, retransmission queue length 0, number of retransmission 2
> First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
> Last retransmission scan length is 1, maximum is 1
> Last retransmission scan time is 0 msec, maximum is 0 msec
> R2#
> =======================================
> OSPF network type point-to-multipoint
> =======================================
>
> R2#sh run int s0/0
> Building configuration...
>
> Current configuration : 326 bytes
> !
> interface Serial0/0
> ip address 139.10.100.2 255.255.255.224
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> ip ospf priority 0
> no fair-queue
> frame-relay map ip 139.10.100.2 205
> frame-relay map ip 139.10.100.4 205 broadcast
> frame-relay map ip 139.10.100.5 205 broadcast
> no frame-relay inverse-arp
> end
>
> R2#sh ip ospf nei det
> Neighbor 139.10.5.5, interface address 139.10.100.5
> In the area 0.0.0.0 via interface Serial0/0
> Neighbor priority is 1, State is FULL, 6 state changes
> DR is 0.0.0.0 BDR is 0.0.0.0
> Options is 0x42
> Dead timer due in 00:01:53
> Neighbor is up for 00:00:15
> Index 1/1, retransmission queue length 0, number of retransmission 1
> First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
> Last retransmission scan length is 1, maximum is 1
> Last retransmission scan time is 0 msec, maximum is 0 msec
> R2#
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