Basic Datacenter Design with Redundancy

The very basic thing that an organization expects while designing its network is maximum uptime, and this maximum uptime can only be achieved when there is redundancy in the network. So in this article, we'll design a network for a company hosted in a datacenter with redundant devices and links.
NOTE: The configuration of devices in this article does not include configuration for securing the control-plane of core or aggregation routers.

Full Network topology:
Topology of Part of Datacenter


Focused view on a specific customer:
Focused view on a specific customer


Download the Network Lab from here:

Datacenter with redundancy.7z

In the scenario, we (As the Service Provider) own network subnet of 192.168.200.0/24 and 172.16.0.0/24. Whereas the network subnet 192.0.2.1 is owned by the customer itself.
We are connected with the two different Internet Service Providers using eBGP. We are also exchanging routes with Internet Exchange Point, where one of our router is placed in their premises and connected to them using eBGP session.
In the setup, we are running OSPF to advertise uplink prefixes and Loopback IP addresses, while BGP is being used to advertise Customers' prefixes as well as the prefixes owned by Datacenter
In this article, the complete configuration of the different devices in the Network is displayed, and the explanation of the configurations can be found below the configuration of each device.



Configuration


Core-1
hostname Core-2
!
interface Loopback0
 description ## For MGMT and BGP peering ##
 ip address 192.168.200.201 255.255.255.255
 ip ospf 1 area 0.0.0.0
!
interface FastEthernet0/0
 description ## Distribution-1 Fa0/0 ##
 ip address 192.168.200.5 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet0/1
 description ## Distribution-2 Fa0/1 ##
 ip address 192.168.200.17 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet1/0
 description ## Core-2 Fa1/0 ##
 no switchport
 ip address 192.168.200.1 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.0
!
interface FastEthernet1/1
 description ## XPoint Fa0/0 ##
 no switchport
 ip address 192.168.200.25 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.0
!
interface FastEthernet1/15
 description ## ISP-1 ##
 no switchport
 ip address 203.0.113.2 255.255.255.252
 ip ospf 1 area 0.0.0.0
 duplex full
 speed 100
!
interface Vlan1
 no ip address
!
router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 area 0.0.0.0 authentication message-digest
 area 0.0.0.10 authentication message-digest
 passive-interface FastEthernet1/15
!
router bgp 64496
 bgp router-id 1.1.1.1
 bgp log-neighbor-changes
 neighbor 192.168.200.202 remote-as 64496
 neighbor 192.168.200.202 description ## Core-2 ##
 neighbor 192.168.200.202 update-source Loopback0
 neighbor 192.168.200.203 remote-as 64496
 neighbor 192.168.200.203 description ## Distribution-1 ##
 neighbor 192.168.200.203 update-source Loopback0
 neighbor 192.168.200.204 remote-as 64496
 neighbor 192.168.200.204 description ## Distribution-2 ##
 neighbor 192.168.200.204 update-source Loopback0
 neighbor 192.168.200.205 remote-as 64496
 neighbor 192.168.200.205 description ## XPoint ##
 neighbor 192.168.200.205 update-source Loopback0
 neighbor 203.0.113.1 remote-as 64510
 neighbor 203.0.113.1 description ## ISP-1 ##
 !
 address-family ipv4
  neighbor 192.168.200.202 activate
  neighbor 192.168.200.203 activate
  neighbor 192.168.200.203 route-map DISTRIBUTION-out out
  neighbor 192.168.200.204 activate
  neighbor 192.168.200.204 route-map DISTRIBUTION-out out
  neighbor 192.168.200.205 activate
  neighbor 192.168.200.205 route-map IXP-in in
  neighbor 192.168.200.205 route-map IXP-out out
  neighbor 203.0.113.1 activate
  neighbor 203.0.113.1 soft-reconfiguration inbound
  neighbor 203.0.113.1 route-map ISP1-in in
  neighbor 203.0.113.1 route-map ISP1-out out
  no auto-summary
  no synchronization
  network 172.16.0.0 mask 255.255.255.0
  network 192.168.200.0
 exit-address-family
!
ip route 172.16.0.0 255.255.255.0 Null0 254
ip route 192.168.200.0 255.255.255.0 Null0 254
!
ip as-path access-list 10 permit ^64510$
!
ip prefix-list ISP-1-default-route seq 5 permit 0.0.0.0/0
!
ip prefix-list NetworkGalaxy-prefix seq 5 permit 172.16.0.0/24
ip prefix-list NetworkGalaxy-prefix seq 10 permit 192.0.2.0/24
ip prefix-list NetworkGalaxy-prefix seq 15 permit 192.168.200.0/24
!
ip prefix-list PREFIX-IXP-in seq 5 permit 0.0.0.0/0 le 24
!
route-map IXP-out permit 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map ISP1-out permit 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map ISP1-in permit 5
 match ip address prefix-list ISP-1-default-route
 set local-preference 250
!
route-map ISP1-in deny 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map ISP1-in permit 100
 match as-path 10
!
route-map DISTRIBUTION-out permit 10
 match ip address prefix-list ISP-1-default-route
!
route-map IXP-in permit 999
 match ip address prefix-list prefix-IXP-in
In the above configuration, we are running OSPF

Core-2
hostname Core-2
!
interface Loopback0
 description ## For MGMT and BGP peering ##
 ip address 192.168.200.202 255.255.255.255
 ip ospf 1 area 0.0.0.0
!
interface FastEthernet0/0
 description ## Distribution-2 Fa 0/0 ##
 ip address 192.168.200.9 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet0/1
 description ## Distribution-1 Fa 0/1 ##
 ip address 192.168.200.13 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet1/0
 description ## Core-1 Fa 1/1 ##
 no switchport
 ip address 192.168.200.2 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.0
!
interface FastEthernet1/1
 description ## XPoint Fa0/1 ##
 no switchport
 ip address 192.168.200.29 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.0
!
interface FastEthernet1/15
 description ## ISP-2 ##
 no switchport
 ip address 198.51.100.2 255.255.255.252
 ip ospf 1 area 0.0.0.0
 duplex full
 speed 100
!
interface Vlan1
 no ip address
!
router ospf 1
 router-id 2.2.2.2
 log-adjacency-changes
 area 0.0.0.0 authentication message-digest
 area 0.0.0.10 authentication message-digest
 passive-interface FastEthernet1/15
!
router bgp 64496
 bgp router-id 2.2.2.2
 bgp log-neighbor-changes
 neighbor 192.168.200.201 remote-as 64496
 neighbor 192.168.200.201 description ## Core-1 ##
 neighbor 192.168.200.201 update-source Loopback0
 neighbor 192.168.200.203 remote-as 64496
 neighbor 192.168.200.203 description ## Distribution-1 ##
 neighbor 192.168.200.203 update-source Loopback0
 neighbor 192.168.200.204 remote-as 64496
 neighbor 192.168.200.204 description ## Distribution-2 ##
 neighbor 192.168.200.204 update-source Loopback0
 neighbor 192.168.200.205 remote-as 64496
 neighbor 192.168.200.205 description ## XPoint ##
 neighbor 192.168.200.205 update-source Loopback0
 neighbor 198.51.100.1 remote-as 64509
 neighbor 198.51.100.1 description ## ISP-2 ##
 !
 address-family ipv4
  neighbor 192.168.200.201 activate
  neighbor 192.168.200.203 activate
  neighbor 192.168.200.203 route-map DISTRIBUTION-out out
  neighbor 192.168.200.204 activate
  neighbor 192.168.200.204 route-map DISTRIBUTION-out out
  neighbor 192.168.200.205 activate
  neighbor 192.168.200.205 route-map IXP-in in
  neighbor 192.168.200.205 route-map IXP-out out
  neighbor 198.51.100.1 activate
  neighbor 198.51.100.1 soft-reconfiguration inbound
  neighbor 198.51.100.1 route-map ISP2-in in
  neighbor 198.51.100.1 route-map ISP2-out out
  no auto-summary
  no synchronization
  network 172.16.0.0 mask 255.255.255.0
  network 192.168.200.0
 exit-address-family
!
ip route 172.16.0.0 255.255.255.0 Null0 254
ip route 192.168.200.0 255.255.255.0 Null0 254
!
ip as-path access-list 10 permit ^64509$
!
ip prefix-list ISP-2-default-route seq 5 permit 0.0.0.0/0
!
ip prefix-list NetworkGalaxy-prefix seq 5 permit 172.16.0.0/24
ip prefix-list NetworkGalaxy-prefix seq 10 permit 192.0.2.0/24
ip prefix-list NetworkGalaxy-prefix seq 15 permit 192.168.200.0/24
!
ip prefix-list PREFIX-IXP-in seq 5 permit 0.0.0.0/0 le 24
!
route-map IXP-out permit 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map ISP2-out permit 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map ISP2-in permit 5
 match ip address prefix-list ISP-2-default-route
 set local-preference 200
!
route-map ISP2-in deny 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map ISP2-in permit 100
 match as-path 10
!
route-map DISTRIBUTION-out permit 10
 match ip address prefix-list ISP-1-default-route
!
route-map IXP-in permit 999
 match ip address prefix-list PREFIX-IXP-in prefix-IXP-in


IXP-RTR
hostname XPoint
!
interface Loopback0
 description ## For MGMT and BGP peering ##
 ip address 192.168.200.205 255.255.255.255
 ip ospf 1 area 0.0.0.0
!
interface FastEthernet0/0
 ip address 192.168.200.26 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.0
 speed 100
 full-duplex
!
interface FastEthernet0/1
 ip address 192.168.200.30 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.0
 speed 100
 full-duplex
!
interface FastEthernet1/0
 description ## Xchange Point RTR ##
 ip address 192.88.99.1 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.0
 duplex auto
 speed auto
!
router ospf 1
 router-id 5.5.5.5
 log-adjacency-changes
 area 0.0.0.0 authentication message-digest
 passive-interface FastEthernet1/0
!
router bgp 64496
 bgp router-id 5.5.5.5
 bgp log-neighbor-changes
 neighbor 192.88.99.2 remote-as 64505
 neighbor 192.88.99.2 description ## IXP ##
 neighbor 192.168.200.201 remote-as 64496
 neighbor 192.168.200.201 description ## Core-1 ##
 neighbor 192.168.200.201 update-source Loopback0
 neighbor 192.168.200.202 remote-as 64496
 neighbor 192.168.200.202 description ## Core-2 ##
 neighbor 192.168.200.202 update-source Loopback0
 neighbor 192.168.200.203 remote-as 64496
 neighbor 192.168.200.203 description ## Distribution-1 ##
 neighbor 192.168.200.203 update-source Loopback0
 neighbor 192.168.200.204 remote-as 64496
 neighbor 192.168.200.204 description ## Distribution-2 ##
 neighbor 192.168.200.204 update-source Loopback0
 !
 address-family ipv4
  neighbor 192.88.99.2 activate
  neighbor 192.88.99.2 soft-reconfiguration inbound
  neighbor 192.88.99.2 route-map IXP-in in
  neighbor 192.88.99.2 route-map IXP-out out
  neighbor 192.168.200.201 activate
  neighbor 192.168.200.202 activate
  neighbor 192.168.200.203 activate
  neighbor 192.168.200.203 route-map Distribution-out out
  neighbor 192.168.200.204 activate
  neighbor 192.168.200.204 route-map Distribution-out out
  no auto-summary
  no synchronization
 exit-address-family
!
ip prefix-list NetworkGalaxy-prefix seq 5 permit 172.16.0.0/24
ip prefix-list NetworkGalaxy-prefix seq 10 permit 192.0.2.0/24
ip prefix-list NetworkGalaxy-prefix seq 15 permit 192.168.200.0/24
!
ip prefix-list prefix-Distribution-out seq 5 deny 0.0.0.0/0 le 32
!
ip prefix-list prefix-IXP-in seq 5 permit 0.0.0.0/0 le 24
!
route-map IXP-out permit 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map IXP-in deny 10
 match ip address prefix-list NetworkGalaxy-prefix
!
route-map IXP-in permit 90
 match ip address prefix-list prefix-IXP-in
!
route-map Distribution-out permit 10
 match ip address prefix-list prefix-Distribution-out


Distribution-1
 hostname Distribution-1
!
interface Loopback0
 description ## For MGMT and BGP peering ##
 ip address 192.168.200.203 255.255.255.255
 ip ospf 1 area 0.0.0.10
!
interface FastEthernet0/0
 description ## Core-1 Fa0/0 ##
 ip address 192.168.200.6 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet0/1
 description ## Core-2 Fa0/1 ##
 ip address 192.168.200.14 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet1/0
 description ## To Client-1 setup ##
 switchport access vlan 101
!
interface FastEthernet1/15
 description ## L2 Trunk between Distribution-1 and Distribution-2 ##
 switchport mode trunk
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan101
 description ## To client-1 setup ##
 ip address 172.16.0.2 255.255.255.248
 standby 101 ip 172.16.0.1
 standby 101 priority 150
 standby 101 preempt
!
router ospf 1
 router-id 11.11.11.11
 log-adjacency-changes
 area 0.0.0.10 authentication message-digest
!
router bgp 64496
 bgp router-id 11.11.11.11
 bgp log-neighbor-changes
 neighbor 192.168.200.201 remote-as 64496
 neighbor 192.168.200.201 description ## Core-1 ##
 neighbor 192.168.200.201 update-source Loopback0
 neighbor 192.168.200.202 remote-as 64496
 neighbor 192.168.200.202 description ## Core-2 ##
 neighbor 192.168.200.202 update-source Loopback0
 neighbor 192.168.200.205 remote-as 64496
 neighbor 192.168.200.205 description ## XPoint ##
 neighbor 192.168.200.205 update-source Loopback0
 !
 address-family ipv4
  redistribute connected
  redistribute static
  neighbor 192.168.200.201 activate
  neighbor 192.168.200.201 route-map Core-1 in
  neighbor 192.168.200.202 activate
  neighbor 192.168.200.202 route-map Core-2 in
  neighbor 192.168.200.205 activate
  neighbor 192.168.200.205 route-map XPoint-in in
  neighbor 192.168.200.205 route-map XPoint-out out
  no auto-summary
  no synchronization
 exit-address-family
!
ip forward-protocol nd
ip route 192.0.2.0 255.255.255.0 172.16.0.4 name ##_Client-1_Vlan101_##
!
!
no ip http server
no ip http secure-server
!
!
ip prefix-list default-in seq 5 permit 0.0.0.0/0
!
ip prefix-list prefix-XPoint-in seq 5 deny 0.0.0.0/0 le 32
mac-address-table static 0000.0c07.ac65 interface FastEthernet1/15 vlan 101
!
route-map Core-2 permit 10
 match ip address prefix-list default-in
!
route-map Core-1 permit 10
 match ip address prefix-list default-in
!
route-map XPoint-in permit 10
 match ip address prefix-list prefix-XPoint-in
!
route-map XPoint-out permit 10


Distribution-2
hostname Distribution-2
!
interface Loopback0
 description ## For MGMT and BGP peering ##
 ip address 192.168.200.204 255.255.255.255
 ip ospf 1 area 0.0.0.10
!
interface FastEthernet0/0
 description ## Core-2 Fa0/0 ##
 ip address 192.168.200.10 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet0/1
 description ## Core-1 Fa0/1 ##
 ip address 192.168.200.18 255.255.255.252
 ip ospf message-digest-key 1 md5 cisco
 ip ospf 1 area 0.0.0.10
 duplex auto
 speed auto
!
interface FastEthernet1/0
 description ## To Client-1 setup ##
 switchport access vlan 101
!
interface FastEthernet1/15
 description ## L2 Trunk between Distribution-2 and Distribution-1 ##
 switchport mode trunk
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan101
 description ## To Client-1 setup ##
 ip address 172.16.0.3 255.255.255.248
 standby 101 ip 172.16.0.1
!
router ospf 1
 router-id 12.12.12.12
 log-adjacency-changes
 area 10 authentication message-digest
 network 192.168.200.10 0.0.0.0 area 10
 network 192.168.200.18 0.0.0.0 area 10
 network 192.168.200.22 0.0.0.0 area 10
 network 192.168.200.204 0.0.0.0 area 10
!
router bgp 64496
 bgp router-id 12.12.12.12
 bgp log-neighbor-changes
 neighbor 192.168.200.201 remote-as 64496
 neighbor 192.168.200.201 description ## Core-1 ##
 neighbor 192.168.200.201 update-source Loopback0
 neighbor 192.168.200.202 remote-as 64496
 neighbor 192.168.200.202 description ## Core-2 ##
 neighbor 192.168.200.202 update-source Loopback0
 neighbor 192.168.200.205 remote-as 64496
 neighbor 192.168.200.205 description ## XPoint ##
 neighbor 192.168.200.205 update-source Loopback0
 !
 address-family ipv4
  redistribute connected
  redistribute static
  neighbor 192.168.200.201 activate
  neighbor 192.168.200.201 route-map Core-1 in
  neighbor 192.168.200.202 activate
  neighbor 192.168.200.202 route-map Core-2 in
  neighbor 192.168.200.205 activate
  neighbor 192.168.200.205 route-map XPoint-in in
  neighbor 192.168.200.205 route-map XPoint-out out
  no auto-summary
  no synchronization
 exit-address-family
!
ip route 192.0.2.0 255.255.255.0 172.16.0.4 name ##_Client-1_Vlan101_##
!
ip prefix-list default-in seq 5 permit 0.0.0.0/0
!
ip prefix-list prefix-XPoint-in seq 5 deny 0.0.0.0/0 le 32
!
route-map Core-2 permit 10
 match ip address prefix-list default-in
!
route-map Core-1 permit 10
 match ip address prefix-list default-in
!
route-map XPoint-in permit 10
 match ip address prefix-list prefix-XPoint-in
!
route-map XPoint-out permit 10




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