From: darbyweaver@yahoo.com
Date: Wed Apr 18 2007 - 00:41:24 ART
Well while I was working it out Brian Dennis (THE AUTHORITY) came to the same conclusion I was creating a practical demonstration for as shown below:
At least I am feeling better about my poor techical ability to understand this stuff and apply it properly...
Ha! Ha!
Killen me...
Seriously though - I was using my routers in this example and I was too lazy to use my own R5... So I substituted R3 and IP Addresses which are irrelevant for the case in question.
So beware...
===========================================Hmmm...
Bear with me, I just used my R1, R2, and R3 with R3 being the hub in this example (Note my R3 is the R5 as specified in this example).
I made R3 a multipoint in the frame section. "R5 should use a subinterface per the diagram". The diagram had a subinterface of 0/0.125.
R1 and R2 are physical interfaces.
I did use an interface command on the subinterface of the Hub - since I wanted the hub to be the DR - for everything to go smoothly ie I wanted the hub to be the DR.
The problem that we encounter in this example at first is that with the restrictions given and the accompanying diagram. We are not allowed to use the neighbor command to fix the Non-Broadcast Adjacency problem. So...
I'm thinking why not change the network types to IP OSPF NETwORK BROADCAST and have an election in April.
The adjacencies will form as per my examples and the restrictions will be honored and although the solution guide is unavailable, I think this meets the requirements and the restrictions.
Here are the interface commands:
Rack01R3(config-router)#do sh run int s0/0/0.123
Building configuration...
Current configuration : 221 bytes
!
interface Serial0/0/0.123 multipoint
ip address 20.20.20.3 255.255.255.0
ip ospf priority 255
frame-relay map ip 20.20.20.1 301 broadcast
frame-relay map ip 20.20.20.2 302 broadcast
no frame-relay inverse-arp
Rack01R3(config-router)#do sh ip ospf int s0/0/0.123
Serial0/0/0.123 is up, line protocol is up
Internet Address 20.20.20.3/24, Area 0
Process ID 1, Router ID 3.3.3.3, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State WAITING, Priority 255
No designated router on this network
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:06
Wait time before Designated router selection 00:00:36
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Rack01R3(config-router)#do sh ip ospf int s0/0/0.123
Serial0/0/0.123 is up, line protocol is up
Internet Address 20.20.20.3/24, Area 0
Process ID 1, Router ID 3.3.3.3, Network Type NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DR, Priority 255
Designated Router (ID) 3.3.3.3, Interface address 20.20.20.3
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:01
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Here is the output after the ip ospf network type is changed from non-broadcast to broadcast.
Rack01R3(config-subif)#do sh run int s0/0/0.123
Building configuration...
Current configuration : 248 bytes
!
interface Serial0/0/0.123 multipoint
ip address 20.20.20.3 255.255.255.0
ip ospf network broadcast
ip ospf priority 255
frame-relay map ip 20.20.20.1 301 broadcast
frame-relay map ip 20.20.20.2 302 broadcast
no frame-relay inverse-arp
end
Rack01R3(config-router)#do sh ip ospf int s0/0/0.123
Serial0/0/0.123 is up, line protocol is up
Internet Address 20.20.20.3/24, Area 0
Process ID 1, Router ID 3.3.3.3, Network Type BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DR, Priority 255
Designated Router (ID) 3.3.3.3, Interface address 20.20.20.3
Backup Designated router (ID) 255.255.255.255, Interface address 20.20.20.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:03
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 4 msec, maximum is 4 msec
Neighbor Count is 2, Adjacent neighbor count is 2
Adjacent with neighbor 2.2.2.2
Adjacent with neighbor 255.255.255.255 (Backup Designated Router)
Suppress hello for 0 neighbor(s)
===================================================
Rack01R2(config-if)#do sh run int s0/0/0
Building configuration...
Current configuration : 303 bytes
!
interface Serial0/0/0
ip address 20.20.20.2 255.255.255.0
encapsulation frame-relay
ip ospf network broadcast
cdp enable
frame-relay map ip 20.20.20.1 203 broadcast
frame-relay map ip 20.20.20.2 203
frame-relay map ip 20.20.20.3 203
no frame-relay inverse-arp
frame-relay lmi-type cisco
end
Rack01R2(config-if)#do sh ip ospf int s0/0/0
Serial0/0/0 is up, line protocol is up
Internet Address 20.20.20.2/24, Area 0
Process ID 1, Router ID 2.2.2.2, Network Type BROADCAST, Cost: 64
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 3.3.3.3, Interface address 20.20.20.3
Backup Designated router (ID) 2.2.2.2, Interface address 20.20.20.2
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:07
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3 (Designated Router)
Suppress hello for 0 neighbor(s)
=============================================
Rack01R1(config-router)#do sh run int s0/0/0
Building configuration...
Current configuration : 264 bytes
!
interface Serial0/0/0
ip address 20.20.20.1 255.255.255.0
encapsulation frame-relay
frame-relay map ip 20.20.20.1 103
frame-relay map ip 20.20.20.2 103
frame-relay map ip 20.20.20.3 103 broadcast
no frame-relay inverse-arp
frame-relay lmi-type cisco
end
Rack01R1(config-if)#do sh ip ospf int s0/0/0
Serial0/0/0 is up, line protocol is up
Internet Address 20.20.20.1/24, Area 0
Process ID 1, Router ID 255.255.255.255, Network Type BROADCAST, Cost: 64
Transmit Delay is 1 sec, State WAITING, Priority 1
No designated router on this network
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:05
Wait time before Designated router selection 00:00:05
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
Rack01R1(config-if)#
*Apr 18 03:24:06.353: %OSPF-5-ADJCHG: Process 1, Nbr 3.3.3.3 on Serial0/0/0 from LOADING to FULL, Loading Done
Rack01R1(config-if)#do sh ip ospf int s0/0/0
Serial0/0/0 is up, line protocol is up
Internet Address 20.20.20.1/24, Area 0
Process ID 1, Router ID 255.255.255.255, Network Type BROADCAST, Cost: 64
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 3.3.3.3, Interface address 20.20.20.3
Backup Designated router (ID) 255.255.255.255, Interface address 20.20.20.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:04
Supports Link-local Signaling (LLS)
Index 2/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 3.3.3.3 (Designated Router)
Suppress hello for 0 neighbor(s)
Rack01R1(config-if)#
Kinda nice watching those adjacencies form...
And if I was not getting enough practice before...
Besides, I need to show some potential employers out there I can explain and demonstrate these tasks and mostly any others in my own words, so this is not a waste of my time and maybe I'll trip, slip, fall from grace and learn something that I may have missed or misunderstood despite my taking a lot of time with the grandmasters of our sport...
I've lurked way too long... (well not quietly lurking but not helping as much as I could).
This archive was generated by hypermail 2.1.4 : Tue May 01 2007 - 08:28:36 ART