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7.1

EIGRP setup with NAT & Several IP Blocks from ISP

Asked by N_W_O in Network Design & Methodology, Network Routers, Network Switches & Hubs

Tags: EIGRP, routing protocals, switching

Hello and thank you for taking the time to read this question.

Please check if my understanding of EIGRP is correct.  Below is an example of my environment and I will be expanding on this example to general practice once confirmed Im have a good understanding.  I will use similar IP addressing to allow for the most accurate description, all the subnets are the same but the numbers themselves I have altered.  I use Metro Ethernet for my transport with 3640 routers at all my remote sites, a 2821 at my co-lo and 3550-EMI switches everything in my network.

My understanding is that with EIGRP, I can simply configure the network with a /24 of the relative network and it will only announce the actual configured network on the router, correct?  Should I use my own summarization and if so, where.  I have read about redistribution, do I need it in this setup?  Should I use EIGRP on my switches only because they can or is there a benefit to doing so?

Assigned to me by my carrier (I have others but not used in this example):
52.117.99.30/30
45.101.128.0/22
52.117.13.0/24
52.117.89.0/24
52.117.18.128/25
52.117.46.128/25

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R1 (colo):
interface GigabitEthernet0/0
description UPLINK to ISP
ip address 52.117.99.30 255.255.255.252
!
interface GigabitEthernet0/1
description UPLINK to ME network
ip address 45.117.128.1 255.255.255.192
ip address 45.117.128.192 255.255.255.224 secondary (for local devices at my local)
ip address 45.117.128.192.255.255.255.224 secondary (for local devices at my local)
!
ip default-gateway 52.117.99.29
ip route 0.0.0.0 0.0.0.0 52.117.99.29
!
router eigrp 1
network 45.101.128.0 0.0.0.255
no auto-summary
 
R2 (Remote site 1):
 
ip dhcp excluded-address 192.168.1.2 192.168.1.10
!
ip dhcp pool vlan3
   network 192.168.1.0 255.255.255.0
   dns-server 4.2.2.2 4.2.2.3 
   default-router 192.168.1.1
!
interface FastEthernet0/0
description UPLINK to ME
ip address 45.117.128.20 255.255.255.192
ip nat outside
!
interface FastEthernet0/1
No ip address
!
interface FastEthernet0/1.1
description UPLINK to LAN (onsite switches)
encapsulation dot1Q 1 native
ip address 45.101.129.65 255.255.255.248
!
interface FastEthernet0/1.2
description UPLINK to Client A
encapsulation dot1Q 75
ip address 52.117.13.1 255.255.255.252
! 
interface FastEthernet0/1.3
description UPLINK to Client B
encapsulation dot1Q 80
ip address 192.168.1.1 255.255.255.0
!
ip default-gateway 45.117.128.1
ip route 0.0.0.0 0.0.0.0 45.117.128.1
!
router eigrp 1
network 45.101.128.0 0.0.0.255
network 45.101.129.0 0.0.0.255
network 52.117.13.0 0.0.0.255
network 52.117.18.0 0.0.0.255
no auto-summary
!
ip nat pool vlan3 52.117.18.141 64.135.18.141 prefix-length 29
ip nat inside source list 3 pool vlan3 overload
!
access-list 3 permit 192.168.1.0 0.0.0.255
 
R3 (Remote site 2):
 
ip dhcp excluded-address 192.168.50.2 192.168.50.10
!
ip dhcp pool vlan3
   network 192.168.50.0 255.255.255.0
   dns-server 4.2.2.2 4.2.2.3 
   default-router 192.168.50.1
!
interface FastEthernet0/0
description UPLINK to ME
ip address 45.117.128.21 255.255.255.192
ip nat outside
!
interface FastEthernet0/1
No ip address
!
interface FastEthernet0/1.1
description UPLINK to LAN (onsite switches)
encapsulation dot1Q 1 native
ip address 45.101.129.74 255.255.255.248
!
interface FastEthernet0/1.2
description UPLINK to Client C
encapsulation dot1Q 2
ip address 52.117.46.129 255.255.255.252
! 
interface FastEthernet0/1.3
description UPLINK to Client D
encapsulation dot1Q 3
ip address 192.168.50.1 255.255.255.0
!
ip default-gateway 45.117.128.21
ip route 0.0.0.0 0.0.0.0 45.117.128.21
!
router eigrp 1
network 45.101.128.0 0.0.0.255
network 45.101.129.0 0.0.0.255
network 52.117.46.0 0.0.0.255
network 52.117.89.0 0.0.0.255
no auto-summary
!
ip nat pool vlan3 52.117.89.141 52.117.89.141 prefix-length 29
ip nat inside source list 3 pool vlan3 overload
!
access-list 3 permit 192.168.1.0 0.0.0.255
[+][-]08/13/09 08:02 PM, ID: 25094969Accepted Solution

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About this solution

Zones: Network Design & Methodology, Network Routers, Network Switches & Hubs
Tags: EIGRP, routing protocals, switching
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Solution Provided By: mikecr
Participating Experts: 2
Solution Grade: A
 
[+][-]08/13/09 09:25 PM, ID: 25095259Author Comment

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[+][-]08/13/09 09:44 PM, ID: 25095316Assisted Solution

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[+][-]08/14/09 07:14 AM, ID: 25098248Expert Comment

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[+][-]08/14/09 04:52 PM, ID: 25103279Author Comment

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[+][-]08/14/09 06:02 PM, ID: 25103459Author Comment

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[+][-]08/16/09 08:14 AM, ID: 25109232Expert Comment

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