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| I'm gonna give this challenge a try, but I have fallen at the first hurdle!
I don't understand why part 1 is asking for the Loopback addresses to be configured for the stated number of hosts, and on Routers 1 & 5 how many hosts are there per VLAN.
Have I missed something obvious here? If so, just give me a little hint - not too much because I want to solve this myself.
Looks like fun, though.
Hippo
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| wlasch 2002-09-01, 9:50 pm |
| Here you go:
R1:
router ospf 100
network 192.168.100.0 0.0.0.31 area 1
area 1 range 192.168.100.0 255.255.255.224
interface Lo0
ip address 192.168.100.1 255.255.255.240
ip ospf network point-to-point
interface Lo1
ip address 192.168.100.17 255.255.255.248
ip ospf network point-to-point
interface Lo2
ip address 192.168.100.25 255.255.255.252
ip ospf network point-to-point
interface Lo3
ip address 192.168.100.29 255.255.255.252
ip ospf network point-to-point
R2:
router ospf 100
network 192.168.100.32 0.0.0.31 area 2
area 2 range 192.168.100.32 255.255.255.224
interface Lo0
ip address 192.168.100.33 255.255.255.240
ip ospf network point-to-point
interface Lo1
ip address 192.168.100.49 255.255.255.248
ip ospf network point-to-point
interface Lo2
ip address 192.168.100.57 255.255.255.252
ip ospf network point-to-point
interface Lo3
ip address 192.168.100.61 255.255.255.252
ip ospf network point-to-point
R3:
router ospf 100
network 192.168.100.64 0.0.0.31 area 3
area 3 range 192.168.100.64 255.255.255.224
interface Lo0
ip address 192.168.100.65 255.255.255.240
ip ospf network point-to-point
interface Lo1
ip address 192.168.100.81 255.255.255.248
ip ospf network point-to-point
interface Lo2
ip address 192.168.100.89 255.255.255.252
ip ospf network point-to-point
interface Lo3
ip address 192.168.100.93 255.255.255.252
ip ospf network point-to-point
R4:
router ospf 100
network 192.168.100.96 0.0.0.31 area 4
area 4 range 192.168.100.96 255.255.255.224
interface Lo0
ip address 192.168.100.97 255.255.255.240
ip ospf network point-to-point
interface Lo1
ip address 192.168.100.113 255.255.255.248
ip ospf network point-to-point
interface Lo2
ip address 192.168.100.121 255.255.255.252
ip ospf network point-to-point
interface Lo3
ip address 192.168.100.125 255.255.255.252
ip ospf network point-to-point
R5:
router ospf 100
network 192.168.100.128 0.0.0.31 area 5
area 5 range 192.168.100.128 255.255.255.224
interface Lo0
ip address 192.168.100.129 255.255.255.240
ip ospf network point-to-point
interface Lo1
ip address 192.168.100.145 255.255.255.248
ip ospf network point-to-point
interface Lo2
ip address 192.168.100.153 255.255.255.252
ip ospf network point-to-point
interface Lo3
ip address 192.168.100.157 255.255.255.252
ip ospf network point-to-point
Notes:
- the above configuration isn't complete - all the enries for area 0 have to be put into the routers to include the respective serial and FDDI interfaces in the backbone area. This just shows the VLSM for the loopbacks and their summarizations
- by default, OSPF advertises loopback address as host addresses with the 32 bit mask. To make it propagate the configured masks, include ip ospf network point-to-point under each loopback interface.
- there is an erroneous statement in the assignment - multiple areas in an OSPF router make it an ABR (Area Border Router), not an ASBR. ASBR is a router that redistributes routes into the OSPF process from another routing protocol or another OSPF process.
Dan | |
| peterd 2002-09-02, 1:56 am |
| Hello Justin.
superb link!
Thanks
Peter | |
| Justin2112 2002-09-05, 3:53 pm |
| Thanks, Dan ! Whoa . . I did not think anybody would do that. Does it come easy ? I find that I must practice this a lot - No one at work to share with, thats why I must connect with the minds of the world through this forum.
PEACE!
Justin | |
| edmonds_robert 2002-09-09, 9:58 pm |
| Anybody have any links that explain in detail when to use a loopback interface and how? I've been confused for a while now. | |
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| edmonds_robert 2002-09-10, 7:06 am |
| The best I could get out of the link (and a couple of others I eventually found) was that it is used when an interface that may not always be active needs to be always active. So you define a loopback interface so the application doesn't see the other interface as down?????? | |
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