Network design questions

Unanswered Question
Apr 2nd, 2012

Hi All,

I'm working on a new network design for my company. We're expanding and opening some more offices and satalite sites. We're a UK based company but opening some US sites.

We have a main UK office (Office A on the diagram) a call centre (Office B) and then two buildings on another site (Office C). The USA offices will be very small and only require a couple of computers, hence the small IP allocation. I have marked the IP addresses of the links on the diagram, I intend to use 3560 switches for all the switches marked and all links will be layer 3 to route multiple VLANs from each site to each site (where permitted).

My question is this: How do I achieve this in the switches? I'm thinking that OSPF is the way forward, is this right? I want to do as little configuration on the switches as possible to allow for dynamic updates of the network (i.e. I don't want to add static routes for everything).

If this is the case, where do I begin with OSPF? I have never set it up before.

If OSPF is the wrong thing to use, then what would you recommend?

Thanks for any help..

Regards

Andrew,.

I have this problem too.
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misterhaq Mon, 04/02/2012 - 14:16

Good Evening

What is the means of connection between Office A and Office B/C. Also, how are the satelites connected with the main office - is it a broadband connection  - or is it a 100mb line etc?

Regards

andrewrocks Mon, 04/02/2012 - 14:39

Hi Imran,

The links are as follows:

A-B = 75mbps Wireless

A-C = 1Gbps Fibre

B-C = 100Mbps LAN Extension

C/A-C/B = Cat5e cable (i.e. 1GBps)

C-USA/A = 100MBps LAN Extension

USA/A-USA/B = 100MBps LAN Extension

USA/A-USA/C = 100MBps LAN Extension

USA/A-USA/D = 100MBps LAN Extension

Does this help?

Regards

Andrew

jpvh12345 Wed, 04/04/2012 - 17:43

If all networking equipment is cisco, the recommendation for a routing protocol is eigrp. You could configure as simply as adding:

Router eigrp 100

Network 172.16.0.0 0.15.255.255

No auto-summary

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andrewrocks Wed, 04/04/2012 - 23:17

Thanks, I'll look into that.

But just for the sake of completeness in my knowledge, is what I'm trying to do with ospf achievable? And if so, where have I gone wrong? According to Wikipedia ospf is a loopless protocol suggesting this should never happen in the first place.

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andrewrocks Thu, 04/05/2012 - 08:07

Hi Imran,

The config is as below. I'm currently doing with with a test setup of 3x3560 switches with A connected to B connected to C connected to A.

Switch A:

no aaa new-model

ip subnet-zero

ip routing

!

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

interface Loopback0

ip address 172.31.255.1 255.255.255.0

!

interface FastEthernet0/1

switchport access vlan 2

switchport mode access

!

interface FastEthernet0/2

!

.......

interface FastEthernet0/47

no switchport

ip address 172.31.254.9 255.255.255.252

!

interface FastEthernet0/48

no switchport

ip address 172.31.254.1 255.255.255.252

!

!

interface Vlan1

ip address 10.20.1.1 255.255.255.0

!

interface Vlan2

ip address 172.1.0.1 255.255.255.0

!

router ospf 1

log-adjacency-changes

network 172.1.0.0 0.0.0.255 area 0

network 172.31.254.1 0.0.0.0 area 0

network 172.31.254.9 0.0.0.0 area 0

!

ip default-gateway 10.20.1.10

ip classless

ip http server

ip http secure-server

!

ip ospf name-lookup

!

snmp-server community public RO

!

control-plane

!

!

Switch B:

no aaa new-model

ip subnet-zero

ip routing

!

!

!

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

interface Loopback0

ip address 172.31.255.3 255.255.255.0

!

interface FastEthernet0/1

switchport access vlan 2

!

interface FastEthernet0/2

!

!

interface FastEthernet0/47

no switchport

ip address 172.31.254.2 255.255.255.252

!

interface FastEthernet0/48

no switchport

ip address 172.31.254.5 255.255.255.252

!

interface GigabitEthernet0/1

!

interface GigabitEthernet0/2

!

interface GigabitEthernet0/3

!

interface GigabitEthernet0/4

!

interface Vlan1

ip address 10.20.1.3 255.255.255.0

!

interface Vlan2

ip address 172.3.0.1 255.255.255.0

!

router ospf 1

log-adjacency-changes

network 172.3.0.0 0.0.0.255 area 0

network 172.31.254.2 0.0.0.0 area 0

network 172.31.254.5 0.0.0.0 area 0

!

ip default-gateway 10.20.1.10

ip classless

ip http server

ip http secure-server

!

!

Switch C:

no aaa new-model

ip subnet-zero

ip routing

!

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

!

interface Loopback0

ip address 172.31.255.2 255.255.255.255

!

interface FastEthernet0/1

!

interface FastEthernet0/2

!

interface FastEthernet0/3

!

interface FastEthernet0/46

!

interface FastEthernet0/47

no switchport

ip address 172.31.254.10 255.255.255.252

!

interface FastEthernet0/48

no switchport

ip address 172.31.254.6 255.255.255.252

!

interface Vlan1

ip address 10.20.1.2 255.255.255.0

!

interface Vlan2

ip address 172.2.0.1 255.255.255.0

!

router ospf 1

log-adjacency-changes

network 172.2.0.0 0.0.0.255 area 0

network 172.31.254.6 0.0.0.0 area 0

network 172.31.254.10 0.0.0.0 area 0

!

ip default-gateway 10.20.1.254

ip classless

ip http server

ip http secure-server

!

andrewrocks Sat, 04/07/2012 - 12:10

Apart from the incorrect subnets on the loop back interfaces can anyone see why I'm getting a loop?

Thanks

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andrewrocks Sat, 04/07/2012 - 12:13

Sorry, I've cross posted this in the LAN forum.

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