hints:routing
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
hints:routing [2020/09/22 21:08] – [Removing default from IBGP] philip | hints:routing [2020/09/22 21:12] (current) – [Complete Configuration] philip | ||
---|---|---|---|
Line 78: | Line 78: | ||
route-map EBGP-in permit 5 | route-map EBGP-in permit 5 | ||
| | ||
- | match ip address prefix-list | + | match ip address prefix-list |
set community no-advertise | set community no-advertise | ||
! | ! | ||
Line 88: | Line 88: | ||
| | ||
neighbor 10.10.10.1 route-map EBGP-in in | neighbor 10.10.10.1 route-map EBGP-in in | ||
+ | distance bgp 20 200 200 | ||
! | ! | ||
</ | </ | ||
Line 97: | Line 98: | ||
With the configuration applied to both Border Routers now, the rest of the routers will see a default route via IS-IS only. There will be no default route in BGP apart from at the Border Routers. Each Border Router will see the default route being learned from the attached external neighbour. And the best path to the default route will be determined by the IS-IS metric attached to the default being propagated by IS-IS. | With the configuration applied to both Border Routers now, the rest of the routers will see a default route via IS-IS only. There will be no default route in BGP apart from at the Border Routers. Each Border Router will see the default route being learned from the attached external neighbour. And the best path to the default route will be determined by the IS-IS metric attached to the default being propagated by IS-IS. | ||
+ | ==== Complete Configuration ==== | ||
+ | |||
+ | For BR1 (making BR1 the //main// default gateway): | ||
+ | |||
+ | < | ||
+ | router isis ISP | ||
+ | ... | ||
+ | | ||
+ | ! | ||
+ | router bgp 64512 | ||
+ | | ||
+ | neighbor 10.10.10.1 route-map EBGP-in in | ||
+ | distance bgp 20 200 200 | ||
+ | ! | ||
+ | ip access-list standard BGP-NH | ||
+ | | ||
+ | | ||
+ | ! | ||
+ | ip prefix-list DEFAULT permit 0.0.0.0/0 | ||
+ | ! | ||
+ | route-map DEFAULT-ORIG permit 5 | ||
+ | match ip address prefix-list DEFAULT | ||
+ | match ip next-hop BGP-NH | ||
+ | ! | ||
+ | route-map EBGP-in permit 5 | ||
+ | | ||
+ | match ip address prefix-list DEFAULT | ||
+ | set community no-advertise | ||
+ | ! | ||
+ | route-map EBGP-in permit 10 | ||
+ | | ||
+ | ... | ||
+ | ! | ||
+ | </ | ||
+ | |||
+ | For BR2 (making BR2 the //backup// default gateway): | ||
+ | |||
+ | < | ||
+ | router isis ISP | ||
+ | ... | ||
+ | | ||
+ | ! | ||
+ | router bgp 64512 | ||
+ | | ||
+ | neighbor 10.10.20.1 route-map EBGP-in in | ||
+ | distance bgp 20 200 200 | ||
+ | ! | ||
+ | ip access-list standard BGP-NH | ||
+ | | ||
+ | | ||
+ | ! | ||
+ | ip prefix-list DEFAULT permit 0.0.0.0/0 | ||
+ | ! | ||
+ | route-map DEFAULT-ORIG permit 5 | ||
+ | match ip address prefix-list DEFAULT | ||
+ | match ip next-hop BGP-NH | ||
+ | set metric 10 | ||
+ | ! | ||
+ | route-map EBGP-in permit 5 | ||
+ | | ||
+ | match ip address prefix-list DEFAULT | ||
+ | set community no-advertise | ||
+ | ! | ||
+ | route-map EBGP-in permit 10 | ||
+ | | ||
+ | ... | ||
+ | ! | ||
+ | </ | ||
[[start| Back to Home page]] | [[start| Back to Home page]] | ||
hints/routing.1600772884.txt.gz · Last modified: 2020/09/22 21:08 by philip