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Understanding the Default Routing Table Groups for Interface
Routes on Packet Transport Switches
On PTX Series Packet Transport Switches, the default
interface-route routing table groups differ from that of other Junos
OS routing devices.
The PTX Series switches are MPLS transit platforms that do IP
forwarding, typically using interior gateway protocol (IGP) routes.
Interface routes are directly connected and local routes.
PTX Series switches are unlike other Junos OS routing devices
in that they force an indirect next-hop resolution. PTX Series switches
need the indirect next hop be resolved to create the chained composite
next hop. This can cause routes to be hidden when the next-hop type
is unusable.
To prevent routes from being hidden, PTX Series platforms automatically
copy the routes in inet.0 into inet.2 and inet.3, and the routes in
inet6.0 into inet6.2 and inet6.3.
The default interface routing table configuration on
the PTX Series switches is as follows:
user@host# show routing-options | display inheritance defaults #### 'interface-routes' was inherited from group 'junos-defaults'##interface-routes {#### 'rib-group' was inherited from group 'junos-defaults'##rib-group {#### 'junos-ifrg-inet0-to-inet2-and-inet3' was inherited from group 'junos-defaults'##inet junos-ifrg-inet0-to-inet2-and-inet3;#### 'junos-ifrg-inet60-to-inet62-and-inet63' was inherited from group 'junos-defaults'##inet6 junos-ifrg-inet60-to-inet62-and-inet63;}}
rib-groups {#### 'junos-ifrg-inet0-to-inet2-and-inet3' was inherited from group 'junos-defaults'##junos-ifrg-inet0-to-inet2-and-inet3 {#### 'inet.0' was inherited from group 'junos-defaults'## 'inet.2' was inherited from group 'junos-defaults'## 'inet.3' was inherited from group 'junos-defaults'##import-rib [ inet.0 inet.2 inet.3 ];}#### 'junos-ifrg-inet60-to-inet62-and-inet63' was inherited from group 'junos-defaults'##junos-ifrg-inet60-to-inet62-and-inet63 {#### 'inet6.0' was inherited from group 'junos-defaults'## 'inet6.2' was inherited from group 'junos-defaults'## 'inet6.3' was inherited from group 'junos-defaults'##import-rib [ inet6.0 inet6.2 inet6.3 ];}}
Published: 2013-02-04
