using virtual tunnel between virtual-router
Example: BGP Path Selection:
| Dual Homed - Dual Router | |
|---|---|
| Ingress traffic / attract traffic on one interface for a Prefix 1- set prefix length ( for iBGP ) on one interface 2- (pre-pend)+ AS-PATH length for this prefix 3- MED ( for eBGP to #AS ) for this prefix - - If copied by intermediate AS - - |
Egress traffic: to "force traffic on 1 interface " Pre-pending AS-PATH | |
| Ingress traffic: Must use transitive Attributes 1- MED ( for eBGP to #AS ) for this prefix - - If copied by intermediate AS - - 2- Community or ext-community |
Egress traffic: 1- set prefix length ( for iBGP ) on one interface | |
| Dual homed - Single router | |
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| iBGP | |
| single CPE router with 2 uplink ( RR ) | 1- loopback as soorce 2- use "from" option to differenciate the 2 uplink >> the remove will show 2 different NH ( CPE uplinks ) |
