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11_cluster_list: all device configurations

CLUSTER_LIST, a two-tier reflector hierarchy and a cluster-ID clash

Everything below is generated from inventory.yaml, baseline/*.cfg, and scenarios/ + templates/ of this lab. The topology, README and the captured output are in README.md.

How to use it by hand

  1. Import and start the lab (labs/labtool.sh 11_cluster_list import and start, or import the .zip in the EVE web UI and start all nodes).
  2. Open each router's console. A fresh router asks Would you like to enter the initial configuration dialog? [yes/no]:. Answer no, press Enter, then type enable.
  3. Type configure terminal and paste that router's block below, then end and write memory.
  4. Routers can be pasted in any order. BGP sessions come up once both ends and the IGP (where the lab has one) are configured.

Management lines. Every block contains a small management section (ip vrf MGMT, FastEthernet0/0 in that VRF, ip route vrf MGMT, username lab, enable secret, line vty). It lets the dashboard and labtool.sh log in over SSH and is not part of the routing design. For a hand-built lab you can leave it out and use only the console. To use SSH you also need crypto key generate rsa modulus 1024 once per router (the bootstrap script does that).

Links

Router A Interface Router B Interface Note
RR-TOP e1/0 RR-EU e1/0 10.0.0.0/30 (OSPF)
RR-TOP e1/1 RR-US e1/0 10.0.0.4/30 (OSPF)
RR-EU e1/1 EU-1 e1/0 10.0.0.8/30 (OSPF)
RR-US e1/1 US-1 e1/0 10.0.0.12/30 (OSPF)

Devices

Router Role AS Management IP
RR-TOP route-reflector 65000 192.168.99.121
RR-EU route-reflector 65000 192.168.99.122
RR-US route-reflector 65000 192.168.99.123
EU-1 leaf 65000 192.168.99.111
US-1 leaf 65000 192.168.99.112

EU-1

hostname EU-1
no ip domain lookup
ip domain name lab.local
!
ip vrf MGMT
 rd 65000:99
!
enable secret lab123
username lab privilege 15 secret lab123
!
interface Loopback0
 ip address 10.255.0.11 255.255.255.255
 ip ospf 1 area 0
!
interface Loopback1
 description === EU network ===
 ip address 10.1.1.1 255.255.255.0
!
interface FastEthernet0/0
 description === MGMT (Cloud1) ===
 ip vrf forwarding MGMT
 ip address 192.168.99.111 255.255.255.0
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/0
 description === to RR-EU ===
 ip address 10.0.0.10 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
router ospf 1
 router-id 10.255.0.11
 passive-interface Loopback0
!
ip route vrf MGMT 0.0.0.0 0.0.0.0 192.168.99.1
!
router bgp 65000
 bgp router-id 10.255.0.11
 bgp log-neighbor-changes
 no bgp default ipv4-unicast
 neighbor 10.255.0.2 remote-as 65000
 neighbor 10.255.0.2 update-source Loopback0
 address-family ipv4
  network 10.1.1.0 mask 255.255.255.0
  neighbor 10.255.0.2 activate
 exit-address-family
!
line vty 0 4
 login local
 transport input ssh
!
end

RR-EU

hostname RR-EU
no ip domain lookup
ip domain name lab.local
!
ip vrf MGMT
 rd 65000:99
!
enable secret lab123
username lab privilege 15 secret lab123
!
interface Loopback0
 ip address 10.255.0.2 255.255.255.255
 ip ospf 1 area 0
!
interface FastEthernet0/0
 description === MGMT (Cloud1) ===
 ip vrf forwarding MGMT
 ip address 192.168.99.122 255.255.255.0
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/0
 description === to RR-TOP ===
 ip address 10.0.0.2 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/1
 description === to EU-1 ===
 ip address 10.0.0.9 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
router ospf 1
 router-id 10.255.0.2
 passive-interface Loopback0
!
ip route vrf MGMT 0.0.0.0 0.0.0.0 192.168.99.1
!
router bgp 65000
 bgp router-id 10.255.0.2
 bgp log-neighbor-changes
 bgp cluster-id 2.2.2.2
 no bgp default ipv4-unicast
 neighbor 10.255.0.1 remote-as 65000
 neighbor 10.255.0.1 update-source Loopback0
 neighbor 10.255.0.11 remote-as 65000
 neighbor 10.255.0.11 update-source Loopback0
 address-family ipv4
  neighbor 10.255.0.1 activate
  neighbor 10.255.0.11 activate
  neighbor 10.255.0.11 route-reflector-client
 exit-address-family
!
line vty 0 4
 login local
 transport input ssh
!
end

RR-TOP

hostname RR-TOP
no ip domain lookup
ip domain name lab.local
!
ip vrf MGMT
 rd 65000:99
!
enable secret lab123
username lab privilege 15 secret lab123
!
interface Loopback0
 ip address 10.255.0.1 255.255.255.255
 ip ospf 1 area 0
!
interface FastEthernet0/0
 description === MGMT (Cloud1) ===
 ip vrf forwarding MGMT
 ip address 192.168.99.121 255.255.255.0
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/0
 description === to RR-EU ===
 ip address 10.0.0.1 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/1
 description === to RR-US ===
 ip address 10.0.0.5 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
router ospf 1
 router-id 10.255.0.1
 passive-interface Loopback0
!
ip route vrf MGMT 0.0.0.0 0.0.0.0 192.168.99.1
!
router bgp 65000
 bgp router-id 10.255.0.1
 bgp log-neighbor-changes
 bgp cluster-id 1.1.1.1
 no bgp default ipv4-unicast
 neighbor 10.255.0.2 remote-as 65000
 neighbor 10.255.0.2 update-source Loopback0
 neighbor 10.255.0.3 remote-as 65000
 neighbor 10.255.0.3 update-source Loopback0
 address-family ipv4
  neighbor 10.255.0.2 activate
  neighbor 10.255.0.2 route-reflector-client
  neighbor 10.255.0.3 activate
  neighbor 10.255.0.3 route-reflector-client
 exit-address-family
!
line vty 0 4
 login local
 transport input ssh
!
end

RR-US

hostname RR-US
no ip domain lookup
ip domain name lab.local
!
ip vrf MGMT
 rd 65000:99
!
enable secret lab123
username lab privilege 15 secret lab123
!
interface Loopback0
 ip address 10.255.0.3 255.255.255.255
 ip ospf 1 area 0
!
interface FastEthernet0/0
 description === MGMT (Cloud1) ===
 ip vrf forwarding MGMT
 ip address 192.168.99.123 255.255.255.0
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/0
 description === to RR-TOP ===
 ip address 10.0.0.6 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/1
 description === to US-1 ===
 ip address 10.0.0.13 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
router ospf 1
 router-id 10.255.0.3
 passive-interface Loopback0
!
ip route vrf MGMT 0.0.0.0 0.0.0.0 192.168.99.1
!
router bgp 65000
 bgp router-id 10.255.0.3
 bgp log-neighbor-changes
 bgp cluster-id 3.3.3.3
 no bgp default ipv4-unicast
 neighbor 10.255.0.1 remote-as 65000
 neighbor 10.255.0.1 update-source Loopback0
 neighbor 10.255.0.21 remote-as 65000
 neighbor 10.255.0.21 update-source Loopback0
 address-family ipv4
  neighbor 10.255.0.1 activate
  neighbor 10.255.0.21 activate
  neighbor 10.255.0.21 route-reflector-client
 exit-address-family
!
line vty 0 4
 login local
 transport input ssh
!
end

US-1

hostname US-1
no ip domain lookup
ip domain name lab.local
!
ip vrf MGMT
 rd 65000:99
!
enable secret lab123
username lab privilege 15 secret lab123
!
interface Loopback0
 ip address 10.255.0.21 255.255.255.255
 ip ospf 1 area 0
!
interface Loopback1
 description === US network ===
 ip address 10.2.1.1 255.255.255.0
!
interface FastEthernet0/0
 description === MGMT (Cloud1) ===
 ip vrf forwarding MGMT
 ip address 192.168.99.112 255.255.255.0
 duplex auto
 speed auto
 no shutdown
!
interface Ethernet1/0
 description === to RR-US ===
 ip address 10.0.0.14 255.255.255.252
 ip ospf 1 area 0
 ip ospf network point-to-point
 duplex auto
 speed auto
 no shutdown
!
router ospf 1
 router-id 10.255.0.21
 passive-interface Loopback0
!
ip route vrf MGMT 0.0.0.0 0.0.0.0 192.168.99.1
!
router bgp 65000
 bgp router-id 10.255.0.21
 bgp log-neighbor-changes
 no bgp default ipv4-unicast
 neighbor 10.255.0.3 remote-as 65000
 neighbor 10.255.0.3 update-source Loopback0
 address-family ipv4
  network 10.2.1.0 mask 255.255.255.0
  neighbor 10.255.0.3 activate
 exit-address-family
!
line vty 0 4
 login local
 transport input ssh
!
end

Scenarios (the change the lab is about)

Scenario 11_cluster_list: CLUSTER_LIST - a cluster-ID clash between tiers makes the reflectors discard each other's routes

RR-US takes RR-TOP's cluster-ID. RR-US discards the EU route reflected by RR-TOP (its own ID is in the cluster list), and RR-TOP discards the US route reflected by RR-US, so US-1 loses 10.1.1.0/24 and EU-1 loses 10.2.1.0/24. All sessions stay up.

Push to: RR-US (the same lines on each), in configuration mode.

Apply

router bgp 65000
 bgp cluster-id 1.1.1.1

Roll back

router bgp 65000
 bgp cluster-id 3.3.3.3

Check the result (after about 40 s):

  • RR-US# show ip bgp 10.1.1.0/24
  • US-1# show ip bgp 10.1.1.0/24
  • RR-TOP# show ip bgp 10.2.1.0/24

Commands used to capture the README output

US-1# show ip bgp 10.1.1.0/24
RR-US# show ip bgp 10.1.1.0/24
RR-TOP# show ip bgp 10.2.1.0/24
EU-1# show ip bgp 10.2.1.0/24
RR-US# show running-config | section router bgp