Скачать или смотреть How to Configure a Policy to Receive Default Routes Only

How to Configure a Policy to Receive Default Routes Only

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R1
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INBOUND POLICY:
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Create a prefix-list:
ip prefix-list DEFAULT-ONLY seq 5 permit 0.0.0.0/0

Create a route-map and match the newly created prefix-list:
route-map DEFAULT-ONLY-ROUTE-MAP permit 10
match ip address prefix-list DEFAULT-ONLY

Apply to neighbor inbound:
router bgp 100
neighbor 192.168.31.3 route-map DEFAULT-ONLY-ROUTE-MAP in
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OUTBOUND POLICY:
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Create a prefix-list:
ip prefix-list LOCAL-ONLY seq 5 permit 192.168.21.0/24

Create a route-map and match the newly created prefix-list:
route-map LOCAL-ONLY-ROUTE-MAP permit 10
match ip address prefix-list LOCAL-ONLY

Apply to neighbor outbound:
router bgp 100
neighbor 192.168.31.3 route-map LOCAL-ONLY-ROUTE-MAP out

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R2
###
###############
INBOUND POLICY:
###############
Create a prefix-list:
ip prefix-list DEFAULT-ONLY seq 5 permit 0.0.0.0/0

Create a route-map and match the newly created prefix-list:
route-map DEFAULT-ONLY-ROUTE-MAP permit 10
match ip address prefix-list DEFAULT-ONLY

Apply to neighbor inbound:
router bgp 100
neighbor 192.168.42.4 route-map DEFAULT-ONLY-ROUTE-MAP in

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OUTBOUND POLICY:
###############
Create a prefix-list:
ip prefix-list LOCAL-ONLY seq 5 permit 192.168.21.0/24

Create a route-map and match the newly created prefix-list:
route-map LOCAL-ONLY-ROUTE-MAP permit 10
match ip address prefix-list LOCAL-ONLY
set as-path prepend 100 100

Apply to neighbor outbound:
router bgp 100
neighbor 192.168.42.4 route-map LOCAL-ONLY-ROUTE-MAP out

Reference:
https://www.cisco.com/c/en/us/support...

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