Junos SNMP via Routing Instance
Juniper routing instances are very useful when you need separate routing tables on the one device, for example to separate customers. Junos lets you configure SNMP polling of routing instances, so customers can poll “their” interfaces using 'instance_name'@'community'. All very useful. But it wasn’t obvious to me how to poll the default table via an interface in a routing instance. The trick is to just use @'community'. Here’s an example.
Network Overview
To demo this I have a simple network. I’m using a Virtual QFX plus Vagrant setup, based on the Vagrantfiles in this repo. I’m running one vqfx10k, connected to one server. The key here is that the server has two connections to the vqfx. One interface is in the default instance, one is in a “Customer” routing instance:
Here’s the routing-instance config:
1
2
3
4
5
6
7
8
vagrant@vqfx> show configuration routing-instances
Customer {
instance-type virtual-router;
interface xe-0/0/1.0;
}
{master:0}
vagrant@vqfx>
And here’s my SNMP configuration:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
vagrant@vqfx> show Continue reading
