Remembering PE-CE EIGRP

1.The EIGRP configuration is identical to RIP.
2.The autonomous system aka AS number can be manually set under the EIGRP VRF routing process.
3. If same AS is used among PE routers
- Internal VPN routes of VPN will be learned as internal routes to other VPN.
- External routes will be seen as external to another VPN sites.
4. If different AS is used among PE routers
- Internal VPN routes of VPN will be learned as external routes to other VPN.
- External routes will be seen as external to another VPN sites.
5. BGP MED and extended communities are used to carry the AS number, route type and metric.
6. BGP Cost community plays an vital role in EIGRP. This is the only community which helps to select the route on the basics of cost not on administrative distance that's why iBGP route selects over the EIGRP route even EIGRP route has more AD number than iBGP.

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