Juniper Routing Tables

Juniper Routing Tables

Routing Tables are used for routing decisions on Routers. For example when you configure BGP, these routes are filled into these Routing Table. There are multiple Routing Tables in Juniper Routers. These Routing Tables and their roles are given below:

 

• inet.0 – Stores IPv4 Unicast Routes
• inet.1 – Stores IPv4 Multicast Routes
• inet.2 – Stores IPv4 Unicast Routes used for Multicast Reverse-path-forwarding (RPF)
• inet.3 – Stores MPLS LSP Eggess IPs
• inet.6.0 – Stores IPv6 Unicast Routes
• inet.6.1 – Stores IPv6 Multicast Routes
• mpls.0 – Switching table of MPLS (Stores Labels)
• iso.0 – Stores IS-IS Routes
• bgp.l2vpn.0 – Used for Layer 2 VPN routes that are learned from BGP
• bgp.l3vpn.0 – Used for Layer 3 VPN routes that are learned from BGP
• l2circuit.0 – For l2circuit routes learned from LDP
• juniper_private – Used for Junos Internal Communcation
• instance-name.inet.0 – Default unicast routing table for a routing instance
• instance-name.inet.2 – Default multicast VRF routing table for a routing instance
• instance-name.inetflow.0 – Flow routing table

 

 

For detailed information, you can check also Juniper website.

To check to Routes, you can use general “show route” command. To check a specific Routing Table, you can use “show routing table” command with the related Routing Table name(inet.0, inet.1 etc.).

 

juniper-router@Kosem> show route table inet.0

inet.0: 4 destinations, 4 routes (4 active, 0 holddown, 0 hidden)

+ = Active Route, – = Last Active, * = Both

192.168.1.0/24 *[Direct/0] 00:09:12 > via ge-1/1/1
172.16.0.0/24 *[Direct/0] 00:09:12 > via ge-1/2/1
10.1.1.1/32 *[Local/0] 00:09:12 Local
172.16.5.0/32 *[Static/5] 00:10:32 > via ge-2/2/2

 

juniper-router@Kosem> show route table inet.1

inet.1: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)

+ = Active Route, – = Last Active, * = Both

224.10.1.1,10.1.1.1/32*[PIM/105] 00:06:23 Multicast 224.20.2.2,
200.1.1.1/32*[PIM/105] 00:07:12 Multicast

 

juniper-router@Kosem> show route table inet6.0

inet6.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)

+ = Active Route, – = Last Active, * = Both

fec0:abcd:11aa:1001::/64 *[Direct/0] 00:02:11 > via ge-1/1/1
fec0:abcd:22bb:2002::/64 *[Direct/0] 00:02:11 > via ge-1/1/2
fec0:0:bbbb:aaaa::5/128 *[Local/0] 00:2:11 Local via fe-0/0/1.0

Juniper Preference Values

Preference Values (Administrative Distance in Cisco), are the values that provide the reliability ratio of a Routing Protocol. The lower values are most reliable routes in the Routing Table. If the preference value increase, the reliability is decrease too.

 

For this reason the better value is 0. Only direct and Local routes has this value. After that the most reliable value is by default 5 which is belong to Static Routes.

 

You can find the Juniper Preference values below:

The above table is the default values of the Routing Protocol Preferences. We can manuplate the values of these Preferences manually. Sometimes network engineers use this method to manage network traffic better.