Hi All,
We have a number of sites in connected via an MPLS network with SP1. We are trying to set up WAN redundancy and have point to point links via SP2 (which we might ultimately use as primary links down the line, based on performance of the links). For this discussion, I have considered 3 sites, HeadOffice, Branch1 & Branch2. [Please see attached diagram - PS: these are just dummy subnets I've included :) ]
HeadOffice:
Cisco 3850 Stack --> Cisco 3900 routers --> PE
- Has 2 links to MPLS cloud (Pri & Backup) which are managed by SP1, and are running BGP between CE & PE.
- Has 2 point to point links - to branch1 & branch2
- Subnets : 10.1.1.0/24 & 192.168.120.0/24
Branch 1:
2 Cisco 3560CX connected via trunk (& running HSRP for some interfaces) --> Cisco 3900 router --> PE
- Has 1 link to MPLS cloud managed by SP1, and is running BGP between CE & PE.
- Has 2 point to point links - to HeadOffice & Branch2
- Subnets : 10.1.2.0/24 & 192.168.122.0/24
Branch 2:
Cisco 3560CX --> Cisco 3900 router --> PE
- Has 1 link to MPLS cloud managed by SP1, and is running BGP between CE & PE.
- Has 2 point to point links - to HeadOffice & Branch1
- Subnets : 10.1.3.0/24 & 192.168.124.0/24
Currently the primary links will be MPLS and the back-up will be point to point (which as mentioned earlier, we may change later). This is the design we have for failover, but I'm not sure if it will work well.
Use static routes for the MPLS network and track using IP SLA. Use BGP between Point to Point links as failover.
HeadOffice - 3850 Stack config :
ip sla1
icmp-echo 10.1.2.10 source-interface vlan 250
frequency 10
timeout 6000
ip sla schedule 1 start-time now life forever
track 10 ip sla1 reachability
ip route 10.1.2.0 255.255.255.0 10.1.1.10 track 10
ip route 192.168.122.0 255.255.255.0 10.1.1.10 track 10
router bgp 64550
bgp log-neighbor-changes
timers bgp 10 30
redistribute connected
redistribute static
neighbor 172.23.254.2 remote-as 64560
Branch 1 - 3560CX config :
ip sla 2
icmp-echo 10.1.1.10 source-interface vlan 250
frequency 10
timeout 6000
ip sla schedule 1 start-time now life forever
track 20 ip sla1 reachability
ip route 10.1.1.0 255.255.255.0 10.1.2.10 track 20
ip route 192.168.120.0 255.255.255.0 10.1.2.10 track 20
router bgp 64560
bgp log-neighbor-changes
timers bgp 10 30
redistribute connected
redistribute static
neighbor 172.23.254.2 remote-as 64550
And similarly for routing between Branch 2 and other sites. Will this work? I am yet to test it out. Does anyone have better suggestions and any config examples which would work better than this?
Thanks in advance.
