According to Juniper Networks, what are three methods of scaling Layer 2 VPNs? (Choose three.)
A. inbound route filters
B. route reflection
C. outbound route filters
D. filter-based forwarding
E. BGP route refresh
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Correct Answer is “BCE”
BCE
Based on Juniper training courses on Layer 2 VPN scaling and Cos, there are 3 options:
1. BGP Route Reflection
2. BGP Route refresh (RFC 2918)
Quoted: The use of BGP route refresh allows for nondisruptive adds, moves, and changes, which, in turn, reduces routing churn by not forcing the termination of PE-PE MP-BGP sessions when changes are made to the VPN topology or membership.
3. BGP Outbound route filter (RFC 4684)
Quoted: Route target filtering can improve efficiency, because it allows a route reflector to reflect only those routes a particular client PE router cares about.
Agree with James Wong:
Route Reflection
A key aspect of the BGP Layer 2 VPN is that no single PE router has to carry all Layer 2 VPN state for the provider’s network. This concept can be extended to route reflection by deploying multiple route reflectors responsible for different pieces of the total VPN customer base. Route reflection has the added advantage of minimizing the number of MP-BGP peering sessions in the provider’s network, which amounts to a true win-win situation.
BGP Route Refresh
The use of BGP route refresh allows for nondisruptive adds, moves, and changes, which, in turn, reduces routing churn by not forcing the termination of PE-PE MP-BGP sessions when changes are made to the VPN topology or membership.
Outbound Route Filters
Route target filtering can improve efficiency, because it allows a route reflector to reflect only those routes a particular client PE router cares about.
B C E