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Regarding eBGP Multipath
Inbound BGP load-balancing from same ISP routerBGP - how does IGP know the right route?Quagga bgp advertisment stop after peer restartQuagga not announcing external routes over ibgp sessionBYO thoughts on BGP routingStruggling inbound and outbound traffic engineering to/from iBGP peers at different POPsRegarding ECMP hashing
In one of the blogs, i read:
"Unlike most routing protocols, BGP only selects a single best path for each prefix. It doesn’t do ECMP (Equal Cost Multi-Path Routing) by default but it is possible to enable this.
In order for BGP to use the second path, the following attributes have to match:
Weight
Local Preference
AS Path (both AS number and AS path length)
Origin code
MED
IGP metric
Also, the next hop address for each path must be different. This comes into play when you are multihomed to the same router."
Que:
Even if all the above attributes match, will the "Router ID" (choose the one with lowest router-id) not be used as a tie-breaker ?
bgp multipath
asked 9 hours ago
fsocietyfsociety
498521
add a comment |
In one of the blogs, i read:
"Unlike most routing protocols, BGP only selects a single best path for each prefix. It doesn’t do ECMP (Equal Cost Multi-Path Routing) by default but it is possible to enable this.
In order for BGP to use the second path, the following attributes have to match:
Weight
Local Preference
AS Path (both AS number and AS path length)
Origin code
MED
IGP metric
Also, the next hop address for each path must be different. This comes into play when you are multihomed to the same router."
Que:
Even if all the above attributes match, will the "Router ID" (choose the one with lowest router-id) not be used as a tie-breaker ?
bgp multipath
asked 9 hours ago
fsocietyfsociety
498521
add a comment |
In one of the blogs, i read:
"Unlike most routing protocols, BGP only selects a single best path for each prefix. It doesn’t do ECMP (Equal Cost Multi-Path Routing) by default but it is possible to enable this.
In order for BGP to use the second path, the following attributes have to match:
Weight
Local Preference
AS Path (both AS number and AS path length)
Origin code
MED
IGP metric
Also, the next hop address for each path must be different. This comes into play when you are multihomed to the same router."
Que:
Even if all the above attributes match, will the "Router ID" (choose the one with lowest router-id) not be used as a tie-breaker ?
bgp multipath
asked 9 hours ago
fsocietyfsociety
498521
In one of the blogs, i read:
"Unlike most routing protocols, BGP only selects a single best path for each prefix. It doesn’t do ECMP (Equal Cost Multi-Path Routing) by default but it is possible to enable this.
In order for BGP to use the second path, the following attributes have to match:
Weight
Local Preference
AS Path (both AS number and AS path length)
Origin code
MED
IGP metric
Also, the next hop address for each path must be different. This comes into play when you are multihomed to the same router."
Que:
Even if all the above attributes match, will the "Router ID" (choose the one with lowest router-id) not be used as a tie-breaker ?
bgp multipath
bgp multipath
asked 9 hours ago
fsocietyfsociety
498521
asked 9 hours ago
fsocietyfsociety
498521
asked 9 hours ago
fsocietyfsociety
498521
asked 9 hours ago
fsocietyfsociety
498521
asked 9 hours ago
fsocietyfsociety
498521
498521
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
If you enable ECMP, the router ID will not be used as tie breaker, because that would defeat the purpose. If all those attributes match, routes are considered to be equal and you can utilise all links with matching attributes.
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
add a comment |
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1 Answer
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If you enable ECMP, the router ID will not be used as tie breaker, because that would defeat the purpose. If all those attributes match, routes are considered to be equal and you can utilise all links with matching attributes.
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
add a comment |
If you enable ECMP, the router ID will not be used as tie breaker, because that would defeat the purpose. If all those attributes match, routes are considered to be equal and you can utilise all links with matching attributes.
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
add a comment |
If you enable ECMP, the router ID will not be used as tie breaker, because that would defeat the purpose. If all those attributes match, routes are considered to be equal and you can utilise all links with matching attributes.
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
If you enable ECMP, the router ID will not be used as tie breaker, because that would defeat the purpose. If all those attributes match, routes are considered to be equal and you can utilise all links with matching attributes.
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
answered 9 hours ago
Teun Vink♦Teun Vink
12.2k53354
12.2k53354
add a comment |
add a comment |
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