Topology:
Requirements:
- Routers R1, R2 and R4 are on the same broadcast segment 10.0.0/24.
- All routers are configure for ISIS area 49.0001 and system-is is 0000.0000.000X where X is the router number.
- Configure the routers, such that only routers R1 and R2 form ISIS neighbor relationship.
- Do not use authentication.
Solution:
Configuring ISIS adjacency-filter on routers R1 and R2 can achieve the required result.Note that you need to make sure that either R1 or R2 are elected DIS on the segment.
R1:
!clns filter-set FILTER permit 49.0001.0000.0000.0002.00
!
router isis TASK2
net 49.0001.0000.0000.0001.00
!
interface Ethernet0/0
ip address 10.0.0.1 255.255.255.0
ip router isis TASK2
isis priority 125
isis adjacency-filter FILTER
!
R2:
!clns filter-set FILTER permit 49.0001.0000.0000.0001.00
!
router isis TASK2
net 49.0001.0000.0000.0002.00
!
interface Ethernet0/1
ip address 10.0.0.2 255.255.255.0
ip router isis TASK2
ip ospf network point-to-point
isis adjacency-filter FILTER
!
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