Hello, I am currently labbing/ planning our design on how to dynamically route between our core sites into our ISP WAN (WAN only no internet).
We have a couple of requirements:
- Advertise default route from each of our two core sites for external sites
- Most external sites wont have a router onsite other than the ISP, so default route back to the ISP for most traffic.
- Our two Core Sites have another Private P2P link that we run eBGP over.
- Advertise either selected routes form our core sites, or all sites if we can advertise everything safely. (No asymmetrical routing between Core sites)
We want to redistribute certain subnets from our internal OSPF areas at each core site into BGP and vice-versa, however we also want to tag the ISP to tag the default routes for each site for failover. (Site A is primary for geographically closer sites etc).
Could someone help with the design here? Not done much BGP/OSPF other than troubleshooting.
Design on our Cores which will connect directly into the ISP router (Via Layer 2 connections).
router bgp xxxx0
no synchronization
bgp router-id xxx.xxx.xxx
bgp log-neighbor-changes
network 172.xxx.xxx.xxx
network 172.xxx.xxx.xxx mask 255.255.255.252
redistribute ospf 100 route-map redistribute-OSPF-to-BGP
default-information originate
neighbor 172.xxx.xxx.xxx remote-as xxxx1
router OSPF 100
redistribute bgp 65533 route-map redistribute-BGP-to-OSPF metric-type 2
Current ASR Config.
ASR-01 & ASR-02
router bgp 65501
bgp router-id 192.168.99.200
bgp log-neighbor-changes
redistribute ospf 1 route-map SNEY->YORK
neighbor 192.168.195.249 remote-as 65502
neighbor 192.168.195.250 remote-as 65502
router ospf 1
router-id 192.168.99.200
auto-cost reference-bandwidth 10000
area 0 authentication message-digest
timers throttle spf 10 100 5000
timers throttle lsa 10 100 5000
timers lsa arrival 80
redistribute bgp 65501 metric-type 1 subnets
passive-interface default
no passive-interface GigabitEthernet0/0/0
no passive-interface GigabitEthernet0/0/1
no passive-interface Port-channel10
ASR-03 & ASR-04
router bgp 65502
bgp router-id 192.168.6.55
bgp log-neighbor-changes
redistribute ospf 100 route-map SITEA->SiteB
neighbor 192.168.195.251 remote-as 65501
neighbor 192.168.195.252 remote-as 65501
Router ospf 100
router-id 192.168.6.55
redistribute static metric-type 1 subnets
redistribute bgp 65502 metric-type 1 subnets
passive-interface default
no passive-interface GigabitEthernet0/0/0
no passive-interface GigabitEthernet0/0/1
no passive-interface Port-channel10
network 192.168.3.0 0.0.0.3 area 699
network 192.168.3.8 0.0.0.3 area 699
network 192.168.6.55 0.0.0.0 area 699
network 192.168.195.56 0.0.0.7 area 699
Cheers
