04-02-2012 11:05 AM - edited 03-07-2019 05:55 AM
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,.
04-02-2012 02:16 PM
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
04-02-2012 02:39 PM
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
04-04-2012 05:43 PM
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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04-04-2012 11:17 PM
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.
Sent from Cisco Technical Support iPhone App
04-05-2012 08:07 AM
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
!
04-07-2012 12:10 PM
Apart from the incorrect subnets on the loop back interfaces can anyone see why I'm getting a loop?
Thanks
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04-07-2012 12:13 PM
Sorry, I've cross posted this in the LAN forum.
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