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MPLS Layer 3 VPN BGP AS Override (Networklessons)
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BGP has a simple loop prevention mechanism for external BGP. When you see your own AS number in the AS path, we do not accept the prefix. This mechanism is fine for Internet routing but there are some other scenarios where this might be an issue. Take a look at the following topology:
Above we have a small MPLS VPN network with two customer sites. The customer is using the same AS number (12) for both sites. When CE1 or CE2 receive an update from each other they will not accept it since their own AS number will be in the AS path.
Let’s find out if this is true. Here are the configurations of all routers:
LINK ĐẶT MUA TÀI LIỆU ONLINE
LINK ĐẶT MUA TÀI LIỆU ONLINE 1
BGP has a simple loop prevention mechanism for external BGP. When you see your own AS number in the AS path, we do not accept the prefix. This mechanism is fine for Internet routing but there are some other scenarios where this might be an issue. Take a look at the following topology:
Above we have a small MPLS VPN network with two customer sites. The customer is using the same AS number (12) for both sites. When CE1 or CE2 receive an update from each other they will not accept it since their own AS number will be in the AS path.
Let’s find out if this is true. Here are the configurations of all routers:
LINK ĐẶT MUA TÀI LIỆU ONLINE
LINK ĐẶT MUA TÀI LIỆU ONLINE 1
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