Tip
This is the documentation for the 22.02 version. Looking for the documentation of the latest version? Have a look here.
VRRP Example¶
This example is a basic two-node VRRP cluster with one node as the owner of an internal and external VR address, and the other as a backup. This is a routed configuration with a statically routed subnet used for the internal LAN.
In this example, the upstream ISP will deliver a routed subnet
(198.51.100.0/24
) to the WAN-side VR address (203.0.113.2
), and internal
clients will use the LAN-side VR address (198.51.100.1
) as their gateway.
Interface tracking is included in the example to protect against a single failure of either WAN or LAN.
See also
See VRRP Configuration for more information on how the commands in the example function.
See Disable Source Pruning for important hardware compatibility information that may necessitate configuration changes before VRRP can function.
Diagram¶
Required Information¶
These tables contain all required information to configure the cluster.
The information in this first table is related to the setup in general, not a specific cluster node.
Item |
Value |
---|---|
Upstream Gateway |
203.0.113.1 |
Routed Subnet |
198.51.100.0/24 |
LAN Client Gateway |
198.51.100.1 |
This information is for the primary node, which in this example is called R1.
Item |
Value |
---|---|
R1 WAN Interface |
0000:06:00.0 |
R1 WAN IP Address |
203.0.113.2/24 |
R1 WAN VR ID |
220 |
R1 WAN VR Address |
203.0.113.2 |
R1 WAN VR Priority |
255 (Owner) |
R1 LAN Interface |
0000:06:00.1 |
R1 LAN IP Address |
198.51.100.1/24 |
R1 LAN VR ID |
210 |
R1 LAN VR Address |
198.51.100.1 |
R1 LAN VR Priority |
255 (Owner) |
R1 Priority Decrease |
240 (15) |
This information is for the secondary node, which in this example is called R2. Note that the interface addresses are different than R1, but the same VR address is used.
Item |
Value |
---|---|
R2 WAN Interface |
0000:06:00.0 |
R2 WAN IP Address |
203.0.113.3/24 |
R2 WAN VR ID |
220 |
R2 WAN VR Address |
203.0.113.2 |
R2 WAN VR Priority |
100 |
R2 LAN Interface |
0000:06:00.1 |
R2 LAN IP Address |
198.51.100.2/24 |
R2 LAN VR ID |
210 |
R2 LAN VR Address |
198.51.100.1 |
R2 LAN VR Priority |
100 |
R2 Priority Decrease |
90 (10) |
Example Configuration¶
The configuration commands in this section show how the settings from the table above are applied to each node. Some additional VRRP settings are shown in the commands but not the tables, but they are using the default values, shown for emphasis.
First, set the R1 interface names:
r1 tnsr(config)# dataplane dpdk dev 0000:06:00.0 network name WAN
r1 tnsr(config)# dataplane dpdk dev 0000:06:00.1 network name LAN
r1 tnsr(config)# service dataplane restart
Next, configure the R1 WAN interface:
r1 tnsr(config)# int WAN
r1 tnsr(config-interface)# ip address 203.0.113.2/24
r1 tnsr(config-interface)# ip vrrp-virtual-router 220
r1 tnsr(config-vrrp4)# preempt true
r1 tnsr(config-vrrp4)# v3-advertisement-interval 100
r1 tnsr(config-vrrp4)# priority 255
r1 tnsr(config-vrrp4)# track-interface LAN priority-decrement 240
r1 tnsr(config-vrrp4)# virtual-address 203.0.113.2
r1 tnsr(config-vrrp4)# exit
r1 tnsr(config-interface)# exit
r1 tnsr(config)#
Next, configure the R1 LAN interface:
r1 tnsr(config)# int LAN
r1 tnsr(config-interface)# ip address 198.51.100.1/24
r1 tnsr(config-interface)# ip vrrp-virtual-router 210
r1 tnsr(config-vrrp4)# preempt true
r1 tnsr(config-vrrp4)# v3-advertisement-interval 100
r1 tnsr(config-vrrp4)# priority 255
r1 tnsr(config-vrrp4)# track-interface WAN priority-decrement 240
r1 tnsr(config-vrrp4)# virtual-address 198.51.100.1
r1 tnsr(config-vrrp4)# exit
r1 tnsr(config-interface)# exit
r1 tnsr(config)#
R1 is now complete.
Set the R2 interface names:
r2 tnsr(config)# dataplane dpdk dev 0000:06:00.0 network name WAN
r2 tnsr(config)# dataplane dpdk dev 0000:06:00.1 network name LAN
r2 tnsr(config)# service dataplane restart
Configure the R2 WAN interface:
r2 tnsr(config)# int WAN
r2 tnsr(config-interface)# ip address 203.0.113.3/24
r2 tnsr(config-interface)# ip vrrp-virtual-router 220
r2 tnsr(config-vrrp4)# preempt true
r2 tnsr(config-vrrp4)# accept-mode true
r2 tnsr(config-vrrp4)# v3-advertisement-interval 100
r2 tnsr(config-vrrp4)# priority 100
r2 tnsr(config-vrrp4)# track-interface LAN priority-decrement 90
r2 tnsr(config-vrrp4)# virtual-address 203.0.113.2
r2 tnsr(config-vrrp4)# exit
r2 tnsr(config-interface)# exit
r2 tnsr(config)#
Finally, configure the R2 LAN interface:
r2 tnsr(config)# int LAN
r2 tnsr(config-interface)# ip address 198.51.100.2/24
r2 tnsr(config-interface)# ip vrrp-virtual-router 210
r2 tnsr(config-vrrp4)# preempt true
r2 tnsr(config-vrrp4)# accept-mode true
r2 tnsr(config-vrrp4)# v3-advertisement-interval 100
r2 tnsr(config-vrrp4)# priority 100
r2 tnsr(config-vrrp4)# track-interface WAN priority-decrement 90
r2 tnsr(config-vrrp4)# virtual-address 198.51.100.1
r2 tnsr(config-vrrp4)# exit
r2 tnsr(config-interface)# exit
r2 tnsr(config)#
At this point, the interface and VRRP configuration is complete for both nodes.
LAN clients in 198.51.100.0/24
can use the LAN VR address of
198.51.100.1
as their default gateway.
VRRP Example with NAT¶
As mentioned in VRRP Compatibility, the example above cannot be used in
combination with NAT because r1 has a priority of 255
on its VR addresses.
To use VRRP with NAT, an additional address not used by either node is required
by TNSR for use as the VRRP virtual address.
The configuration is largely the same as above, with a few key differences. An example for this configuration is covered in VRRP with Outside NAT.