Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Example - BGP in a VLT topology

The following spine-leaf VLT topology runs BGP for Layer 3 communication.

Spine 1 configuration

1. Configure a VLAN interface on which the BGP session has to be formed with VLT peers.

   Spine1(config)# interface vlan101
   Spine1(conf-if-vl-101)# ip address 10.0.1.1/29
   Spine1(conf-if-vl-101)# mtu 9216
   Spine1(conf-if-vl-101)# exit

2. Configure port channel interfaces between Spine and VLT peers. Add it as part of the created VLAN.

   Spine1(config)# interface port-channel1
   Spine1(conf-if-po-1)# mtu 9216
   Spine1(conf-if-po-1)# switchport mode trunk
   Spine1(conf-if-po-1)# switchport trunk allowed vlan 101
   Spine1(conf-if-po-1)# exit
   Spine1(config)# interface ethernet1/1/1
   Spine1(conf-if-eth1/1/1)# channel-group 1 mode active
   Spine1(conf-if-eth1/1/1)# exit
   Spine1(config)# interface ethernet1/1/2
   Spine1(conf-if-eth1/1/2)# channel-group 1 mode active
   Spine1(conf-if-eth1/1/2)# exit

3. Configure eBGP neighbor with VLT peer1 and VLT peer2.

   Spine1(config)# router bgp 65101
   Spine1(config-router-bgp-65101)# router-id 10.1.1.1
   Spine1(config-router-bgp-65101)# neighbor 10.0.1.2
   Spine1(config-router-neighbor)# remote-as 65201
   Spine1(config-router-neighbor)# no shutdown
   Spine1(config-router-neighbor)# exit
   Spine1(config-router-bgp-65101)# neighbor 10.0.1.3
   Spine1(config-router-neighbor)# remote-as 65201
   Spine1(config-router-neighbor)# no shutdown
   Spine1(config-router-neighbor)# exit

Leaf 1 configuration

1. Configure VLT peering between VLT peer 1 and VLT peer 2.

   Leaf1(config)# interface range ethernet1/1/3-1/1/4
   Leaf1(conf-range-eth1/1/3-1/1/4)# no switchport
   Leaf1(conf-range-eth1/1/3-1/1/4)# exit
   Leaf1(config)# vlt-domain 1
   Leaf1(conf-vlt-1)# backup destination 192.168.1.2
   Leaf1(conf-vlt-1)# discovery-interface ethernet1/1/3-1/1/4
   Leaf1(conf-vlt-1)# primary-priority 1
   Leaf1(conf-vlt-1)# vlt-mac de:11:de:11:de:11
   Leaf1(conf-vlt-1)# peer-routing
   Leaf1(conf-vlt-1)# exit

2. Configure VLAN interfaces on which BGP sessions has to be formed with Spine and ToR switches.

   Leaf1(config)# interface vlan101
   Leaf1(conf-if-vl-101)# ip address 10.0.1.2/29
   Leaf1(conf-if-vl-101)# mtu 9216
   Leaf1(conf-if-vl-101)# exit
   Leaf1(config)# interface vlan201
   Leaf1(conf-if-vl-201)# ip address 10.0.2.1/29
   Leaf1(conf-if-vl-201)# mtu 9216
   Leaf1(conf-if-vl-201)# exit
   Leaf1(config)# interface vlan301
   Leaf1(conf-if-vl-301)# ip address 10.0.3.1/29
   Leaf1(conf-if-vl-301)# mtu 9216
   Leaf1(conf-if-vl-301)# exit

3. Configure VLT port-channel with Spine 1.

   Leaf1(config)# interface port-channel1
   Leaf1(conf-if-po-1)# mtu 9216
   Leaf1(conf-if-po-1)# switchport mode trunk
   Leaf1(conf-if-po-1)# switchport trunk allowed vlan 101
   Leaf1(conf-if-po-1)# vlt-port-channel 1
   Leaf1(conf-if-po-1)# exit
   Leaf1(config)# interface ethernet1/1/1
   Leaf1(conf-if-eth1/1/1)# channel-group 1 mode active
   Leaf1(conf-if-eth1/1/1)# exit

4. Configure VLT port-channels with ToR 1 and ToR 2.

   Leaf1(config)# interface port-channel2
   Leaf1(conf-if-po-2)# mtu 9216
   Leaf1(conf-if-po-2)# switchport mode trunk
   Leaf1(conf-if-po-2)# switchport trunk allowed vlan 201
   Leaf1(conf-if-po-2)# vlt-port-channel 2
   Leaf1(conf-if-po-2)# exit
   Leaf1(config)# interface ethernet1/1/5
   Leaf1(conf-if-eth1/1/5)# channel-group 2 mode active
   Leaf1(conf-if-eth1/1/5)# exit
   Leaf1(config)# interface port-channel3
   Leaf1(conf-if-po-3)# mtu 9216
   Leaf1(conf-if-po-3)# switchport mode trunk
   Leaf1(conf-if-po-3)# switchport trunk allowed vlan 301
   Leaf1(conf-if-po-3)# vlt-port-channel 3
   Leaf1(conf-if-po-3)# exit
   Leaf1(config)# interface ethernet1/1/6
   Leaf1(conf-if-eth1/1/6)# channel-group 3 mode active
   Leaf1(conf-if-eth1/1/6)# exit

5. Configure the eBGP neighbor with Spine 1 and iBGP neighbor with ToR 1 and ToR 2.

   Leaf1(config)# router bgp 65201
   Leaf1(config-router-bgp-65201)# router-id 10.2.1.1
   Leaf1(config-router-bgp-65201)# neighbor 10.0.1.1
   Leaf1(config-router-neighbor)# remote-as 65101
   Leaf1(config-router-neighbor)# no shutdown
   Leaf1(config-router-neighbor)# exit
   Leaf1(config-router-bgp-65201)# neighbor 10.0.2.3
   Leaf1(config-router-neighbor)# remote-as 65201
   Leaf1(config-router-neighbor)# route-reflector-client
   Leaf1(config-router-neighbor)# no shutdown
   Leaf1(config-router-neighbor)# address-family ipv4 unicast
   Leaf1(config-router-bgp-neighbor-af)# next-hop-self
   Leaf1(config-router-bgp-neighbor-af)# exit
   Leaf1(config-router-neighbor)# exit
   Leaf1(config-router-bgp-65201)# neighbor 10.0.3.3
   Leaf1(config-router-neighbor)# remote-as 65201
   Leaf1(config-router-neighbor)# route-reflector-client
   Leaf1(config-router-neighbor)# no shutdown
   Leaf1(config-router-neighbor)# address-family ipv4 unicast
   Leaf1(config-router-bgp-neighbor-af)# next-hop-self
   Leaf1(config-router-bgp-neighbor-af)# exit
   Leaf1(config-router-neighbor)# exit

Leaf 2 configuration

1. Configure VLT peering between VLT peer 1 and VLT peer 2.

   Leaf2(config)# interface range ethernet1/1/3-1/1/4
   Leaf2(conf-range-eth1/1/3-1/1/4)# no switchport
   Leaf2(conf-range-eth1/1/3-1/1/4)# exit
   Leaf2(config)# vlt-domain 1
   Leaf2(conf-vlt-1)# backup destination 192.168.1.1
   Leaf2(conf-vlt-1)# discovery-interface ethernet1/1/3-1/1/4
   Leaf2(conf-vlt-1)# primary-priority 65535
   Leaf2(conf-vlt-1)# vlt-mac de:11:de:11:de:11
   Leaf2(conf-vlt-1)# peer-routing
   Leaf2(conf-vlt-1)# exit

2. Configure VLAN interfaces on which BGP sessions has to be formed with Spine and ToR switches.

   Leaf2(config)# interface vlan101
   Leaf2(conf-if-vl-101)# ip address 10.0.1.3/29
   Leaf2(conf-if-vl-101)# mtu 9216
   Leaf2(conf-if-vl-101)# exit
   Leaf2(config)# interface vlan201
   Leaf2(conf-if-vl-201)# ip address 10.0.2.2/29
   Leaf2(conf-if-vl-201)# mtu 9216
   Leaf2(conf-if-vl-201)# exit
   Leaf2(config)# interface vlan301
   Leaf2(conf-if-vl-301)# ip address 10.0.3.2/29
   Leaf2(conf-if-vl-301)# mtu 9216
   Leaf2(conf-if-vl-301)# exit

3. Configure VLT port-channel with Spine 1.

   Leaf2(config)# interface port-channel1
   Leaf2(conf-if-po-1)# mtu 9216
   Leaf2(conf-if-po-1)# switchport mode trunk
   Leaf2(conf-if-po-1)# switchport trunk allowed vlan 101
   Leaf2(conf-if-po-1)# vlt-port-channel 1
   Leaf2(conf-if-po-1)# exit
   Leaf2(config)# interface ethernet1/1/1
   Leaf2(conf-if-eth1/1/1)# channel-group 1 mode active
   Leaf2(conf-if-eth1/1/1)# exit

4. Configure VLT port-channels with ToR 1 and ToR 2.

   Leaf2(config)# interface port-channel2
   Leaf2(conf-if-po-2)# mtu 9216
   Leaf2(conf-if-po-2)# switchport mode trunk
   Leaf2(conf-if-po-2)# switchport trunk allowed vlan 201
   Leaf2(conf-if-po-2)# vlt-port-channel 2
   Leaf2(conf-if-po-2)# exit
   Leaf2(config)# interface ethernet1/1/5
   Leaf2(conf-if-eth1/1/5)# channel-group 2 mode active
   Leaf2(conf-if-eth1/1/5)# exit
   Leaf2(config)# interface port-channel3
   Leaf2(conf-if-po-3)# mtu 9216
   Leaf2(conf-if-po-3)# switchport mode trunk
   Leaf2(conf-if-po-3)# switchport trunk allowed vlan 301
   Leaf2(conf-if-po-3)# vlt-port-channel 3
   Leaf2(conf-if-po-3)# exit
   Leaf2(config)# interface ethernet1/1/6
   Leaf2(conf-if-eth1/1/6)# channel-group 3 mode active
   Leaf2(conf-if-eth1/1/6)# exit

5. Configure the eBGP neighbor with Spine 1 and iBGP neighbor with ToR 1 and ToR 2.

   Leaf2(config)# router bgp 65201
   Leaf2(config-router-bgp-65201)# router-id 10.2.1.2
   Leaf2(config-router-bgp-65201)# neighbor 10.0.1.1
   Leaf2(config-router-neighbor)# remote-as 65101
   Leaf2(config-router-neighbor)# no shutdown
   Leaf2(config-router-neighbor)# exit
   Leaf2(config-router-bgp-65201)# neighbor 10.0.2.3
   Leaf2(config-router-neighbor)# remote-as 65201
   Leaf2(config-router-neighbor)# route-reflector-client
   Leaf2(config-router-neighbor)# no shutdown
   Leaf2(config-router-neighbor)# address-family ipv4 unicast
   Leaf2(config-router-bgp-neighbor-af)# next-hop-self
   Leaf2(config-router-bgp-neighbor-af)# exit
   Leaf2(config-router-neighbor)# exit
   Leaf2(config-router-bgp-65201)# neighbor 10.0.3.3
   Leaf2(config-router-neighbor)# remote-as 65201
   Leaf2(config-router-neighbor)# route-reflector-client
   Leaf2(config-router-neighbor)# no shutdown
   Leaf2(config-router-neighbor)# address-family ipv4 unicast
   Leaf2(config-router-bgp-neighbor-af)# next-hop-self
   Leaf2(config-router-bgp-neighbor-af)# exit
   Leaf2(config-router-neighbor)# exit

ToR 1 configuration

1. Configure VLAN interface on which the BGP session has to be formed with VLT peers.

   ToR1(config)# interface vlan201
   ToR1(conf-if-vl-201)# ip address 10.0.2.3/29
   ToR1(conf-if-vl-201)# mtu 9216
   ToR1(conf-if-vl-201)# exit

2. Configure a port channel interface between ToR1 and VLT peers. Add it as part of the above created VLAN.

   ToR1(config)# interface port-channel2
   ToR1(conf-if-po-1)# mtu 9216
   ToR1(conf-if-po-1)# switchport mode trunk
   ToR1(conf-if-po-1)# switchport trunk allowed vlan 201
   ToR1(conf-if-po-1)# exit
   ToR1(config)# interface ethernet1/1/1
   ToR1(conf-if-eth1/1/1)# channel-group 2 mode active
   ToR1(conf-if-eth1/1/1)# exit
   ToR1(config)# interface ethernet1/1/2
   ToR1(conf-if-eth1/1/2)# channel-group 2 mode active
   ToR1(conf-if-eth1/1/2)# exit

3. Configure the host facing VLAN and add host connected interfaces to it.

   ToR1(config)# interface vlan2001
   ToR1(conf-if-vl-2001)# ip address 172.16.1.1/24
   ToR1(conf-if-vl-2001)# mtu 9216
   ToR1(conf-if-vl-2001)# exit
   ToR1(config)# interface ethernet1/1/3
   ToR1(conf-if-eth1/1/3)# mtu 9216
   ToR1(conf-if-eth1/1/3)# switchport mode trunk
   ToR1(conf-if-eth1/1/3)# switchport trunk allowed vlan 2001
   ToR1(conf-if-eth1/1/3)# exit

4. Configure the iBGP neighbor with VLT peers and advertise the host subnet.

   ToR1(config)# router bgp 65201
   ToR1(config-router-bgp-65201)# router-id 10.3.1.1
   ToR1(config-router-bgp-65201)# address-family ipv4 unicast
   ToR1(configure-router-bgpv4-af)# network 172.16.1.0/24
   ToR1(configure-router-bgpv4-af)# exit
   ToR1(config-router-bgp-65201)# neighbor 10.0.2.1
   ToR1(config-router-neighbor)# remote-as 65201
   ToR1(config-router-neighbor)# no shutdown
   ToR1(config-router-neighbor)# exit
   ToR1(config-router-bgp-65201)# neighbor 10.0.2.2
   ToR1(config-router-neighbor)# remote-as 65201
   ToR1(config-router-neighbor)# no shutdown
   ToR1(config-router-neighbor)# exit

ToR 2 configuration

1. Configure a VLAN interface on which the BGP session has to be formed with VLT peers.

   ToR2(config)# interface vlan301
   ToR2(conf-if-vl-201)# mtu 9216
   ToR2(conf-if-vl-201)# ip address 10.0.3.3/29
   ToR2(conf-if-vl-201)# exit

2. Configure a port channel interface between ToR2 and VLT peers. Add it as part of the above created VLAN.

   ToR2(config)# interface port-channel3
   ToR2(conf-if-po-1)# mtu 9216
   ToR2(conf-if-po-1)# switchport mode trunk
   ToR2(conf-if-po-1)# switchport trunk allowed vlan 301
   ToR2(conf-if-po-1)# exit
   ToR2(config)# interface ethernet1/1/1
   ToR2(conf-if-eth1/1/1)# channel-group 3 mode active
   ToR2(conf-if-eth1/1/1)# exit
   ToR2(config)# interface ethernet1/1/2
   ToR2(conf-if-eth1/1/2)# channel-group 3 mode active
   ToR2(conf-if-eth1/1/2)# exit

3. Configure the host facing VLAN and add host connected interfaces to it.

   ToR2(config)# interface vlan3001
   ToR2(conf-if-vl-2001)# mtu 9216
   ToR2(conf-if-vl-2001)# ip address 172.16.2.1/24
   ToR2(conf-if-vl-2001)# exit
   ToR2(config)# interface ethernet1/1/3
   ToR2(conf-if-eth1/1/3)# mtu 9216
   ToR2(conf-if-eth1/1/3)# switchport mode trunk
   ToR2(conf-if-eth1/1/3)# switchport trunk allowed vlan 3001
   ToR2(conf-if-eth1/1/3)# exit

4. Configure the iBGP neighbor with VLT peers and advertise the host subnet.

   ToR2(config)# router bgp 65201
   ToR2(config-router-bgp-65201)# router-id 10.3.1.2
   ToR2(config-router-bgp-65201)# address-family ipv4 unicast
   ToR2(configure-router-bgpv4-af)# network 172.16.2.0/24
   ToR2(configure-router-bgpv4-af)# exit
   ToR2(config-router-bgp-65201)# neighbor 10.0.2.1
   ToR2(config-router-neighbor)# remote-as 65201
   ToR2(config-router-neighbor)# no shutdown
   ToR2(config-router-neighbor)# exit
   ToR2(config-router-bgp-65201)# neighbor 10.0.2.2
   ToR2(config-router-neighbor)# remote-as 65201
   ToR2(config-router-neighbor)# no shutdown
   ToR2(config-router-neighbor)# exit