Configuring Is-Is Route Leaking - HP FlexFabric 12900E Series Configuration Manual

Filtering routes calculated from received LSPs
IS-IS saves LSPs received from neighbors in the LSDB, and uses the SPF algorithm to calculate the
shortest path tree with itself as the root. IS-IS installs the calculated routes to the IS-IS routing table
and the optimal routes to the IP routing table.
Perform this task to filter calculated routes. Only routes that are not filtered can be added to the IP
routing table. The filtered routes retain in the IS-IS routing table and can be advertised to neighbors.
To filter routes calculated using received LSPs:
Step
1. Enter system view.
2. Enter
unicast
family view.
3. Filter
calculated
received LSPs.
Filtering redistributed routes
IS-IS can redistribute routes from other routing protocols or other IS-IS processes, add them to the
IS-IS routing table, and advertise them in LSPs.
Perform this task to filter redistributed routes. Only routes that are not filtered can be added to the
IS-IS routing table and advertised to neighbors.
To filter redistributed routes:
Step
1. Enter system view.
2. Enter IS-IS IPv4 unicast
address family view.
3. Filter
from other routing protocols
or IS-IS processes.

Configuring IS-IS route leaking

Perform this task to control route advertisement (route leaking) between Level-1 and Level-2.
You can configure IS-IS to advertise routes from Level-2 to Level-1, and to not advertise routes from
Level-1 to Level-2.
To configure IS-IS route leaking:
Step
1. Enter system view.
Command
system-view
a isis
IS-IS IPv4
vpn-instance-name ]
address
b cost-style { wide | wide-compatible }
c address-family ipv4 [ unicast ]
routes
filter-policy { ipv4-acl-number | prefix-list
using
prefix-list-name
route-policy-name } import
Command
system-view
a
b
c
filter-policy { ipv4-acl-number | prefix-list
routes redistributed
prefix-list-name
route-policy-name } export [ protocol
[ process-id ] ]
Command
system-view
[ process-id ] [ vpn-instance
| route-policy
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
cost-style { wide | wide-compatible }
address-family ipv4 [ unicast ]
|
146
Remarks
N/A
N/A
By default,
filtering is not configured.
Remarks
N/A
N/A
By default, IS-IS route
route-policy
filtering
configured.
Remarks
N/A
IS-IS route
is not