This topology is the same as my previous blogtorial.
What is an OTV Adjacency Server?
"Overlay Transport Virtualization (OTV) provides support for nonmulticast-capable, unicast-only core networks through the OTV Adjacency Server feature. An edge device is configured as an adjacency server (primary or secondary). All other edge devices are configured with the IPv4 addresses of the primary and secondary adjacency servers, after which the edge devices communicate their reachability and capability information to the primary and secondary adjacency servers. Wide-Area Networking Configuration Guide: Overlay Transport Virtualization, Cisco IOS XE Release 3S 2 OTV Adjacency Server Restrictions for OTV Adjacency Server You can configure more than one adjacency server per VPN. An adjacency server can serve multiple VPNs. An adjacency server can also connect an OTV site to one or more VPNs." - Cisco.com
First let's get the IP and the transport layer or the underlay network configured.
We will start with the East site.
CORE-East-1
I had to bring up two interfaces between the virtual core and edge because I couldn't configure just one port as trunk. In real devices this should not be necessary.
hostname CORE-East-1
!
ip cef
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 5 priority 4096
!
interface Ethernet0/0
description ESXI-VMS
switchport access vlan 5
switchport mode access
!
interface Ethernet0/2
description interface_to_extend_the_vlan
switchport mode access
switchport access vlan 5
!
interface Ethernet0/3
description interface_to_bring_up_OTV_site_vlan
switchport access vlan 56
switchport mode access
!
interface Vlan5
description ESXI-VMS
ip address 5.5.5.1 255.255.255.0
!
OTV-East-Edge-1
For now we will configure just the IP interfaces and enable OSPF so we have Layer 3 IP reachability between the sites.
license grace-period
!
hostname OTV-East-Edge-1
!
!!--Enable the required features
feature ospf
feature otv
!
!!--Create the necessary VLANs
vlan 5
name ESXI-VMS
vlan 56
name OTV_SITE_VLAN
!
interface Ethernet2/1
ip address 3.3.3.1/30
no shutdown
!
interface Ethernet2/2
switchport
switchport access vlan 5
no shutdown
!
interface Ethernet2/3
switchport
switchport access vlan 56
no shutdown
!
!!--Enabling OSPF so we have unicast reachability
router ospf 1
network 0.0.0.0/0 area 0.0.0.0
ISN-East-1
Now let's get the Data Center Edge configured. It's considered best practices to bring the DCI (Data Center Interconnects) into its own set of routers, therefore in this topology I am bringing them into a pair of ISN routers (InterSite Network Routers), but technically they could have gone directly into the Core Routers (perhaps in its own VDC).
hostname ISN-East-1
!
ip cef
!
interface Ethernet0/0
description DCI - Data Center Interconnect
no switchport
ip address 2.2.2.2 255.255.255.252
!
interface Ethernet0/1
description Connected_TO_OTV_EDGE
no switchport
ip address 3.3.3.2 255.255.255.252
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
!
Now let's get the West Site configured the same as the East Site and then we will move on to the configurations pertaining to the overlay network and configure OTV.
Core-West-1
hostname CORE-West-1
!
ip cef
!
spanning-tree mode rapid-pvst
spanning-tree extend system-id
spanning-tree vlan 5 priority 4096
!
interface Ethernet0/0
description ESXI-VMS
switchport access vlan 5
switchport mode access
!
interface Ethernet0/2
description interface_to_extend_the_vlan
switchport mode access
switchport access vlan 5
!
interface Ethernet0/3
description interface_to_bring_up_OTV_site_vlan
switchport access vlan 55
switchport mode access
!
interface Vlan5
description ESXI-VMS
ip address 5.5.5.1 255.255.255.0
!
OTV-West-Edge-1
license grace-period
!
hostname OTV-West-Edge-1
!
!!--Enable the required features
feature ospf
feature otv
!
!!--Create the necessary VLANs
vlan 5
name ESXI-VMS
vlan 55
name OTV_SITE_VLAN
!
interface Ethernet2/1
ip address 1.1.1.1/30
no shutdown
!
interface Ethernet2/2
switchport
switchport access vlan 5
no shutdown
!
interface Ethernet2/3
switchport
switchport access vlan 56
no shutdown
!
!!--Enabling OSPF so we have unicast reachability
router ospf 1
network 0.0.0.0/0 area 0.0.0.0
ISN-West-1 hostname ISN-West-1
!
!
ip cef
!
interface Ethernet0/0
description DCI - Data Center Interconnect
no switchport
ip address 2.2.2.1 255.255.255.252
!
interface Ethernet0/1
description Connected_TO_OTV_EDGE
no switchport
ip address 1.1.1.2 255.255.255.252
!
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
At this point, we should have full IP unicast reachability between the devices and multicast has not been enabled. Let's now configure OTV with OTV Adjacency server. In our topology OTV-East-Edge-1 will be the OTV Adjacency Server and OTV-West-Edge-1 will be the OTV client.
OTV-East-Edge-1 will use the join interface, which in this case Ethernet 2/1's IP as the adjacency server IP that the remote clients should be configured with.
OTV-East-Edge-1 OTV Configurations
hostname OTV-East-Edge-1
!
vlan 56
name OTV_SITE_VLAN
otv site-vlan 56
!
interface Overlay1
otv join-interface Ethernet2/1
otv adjacency-server unicast-only !!--OTV Adjacency Server
otv extend-vlan 5
no shutdown
OTV-West-Edge-1 OTV Configurations
hostname OTV-West-Edge-1
!
vlan 55
name OTV_SITE_VLAN
otv site-vlan 55
!
interface Overlay1
otv join-interface Ethernet2/1
otv use-adjacency-server 3.3.3.1 unicast-only !!--OTV Adjacency Client
otv extend-vlan 5
no shutdown Verification
OTV-East-Edge-1# show otv
OTV Overlay Information
Overlay interface Overlay1
VPN name : Overlay1
VPN state : UP
Extended vlans : 5 (Total:1)
Join interface(s) : Eth2/1 (3.3.3.1)
Site vlan : 55 (up)
AED-Capable : Yes
Capability : Unicast-Only
Is Adjacency Server : Yes
Adjacency Server(s) : None / None
From the client perspective it tells you who the OTV Adjacency Server is.
OTV-West-Edge-1# show otv
VPN name : Overlay1
VPN state : UP
Extended vlans : 5 (Total:1)
Join interface(s) : Eth2/1 (1.1.1.1)
Capability : Unicast-only
Is Adjacency Server : No
Adj Server Configured : Yes
Prim/Sec Adj Svr(s) : 3.3.3.1 / [None]
Many more articles to come so ....
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