Regarding eBGP MultipathInbound 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
How to detach yourself from a character you're going to kill?
Avoiding cliches when writing gods
When writing an error prompt, should we end the sentence with a exclamation mark or a dot?
Is it OK to bring delicacies from hometown as tokens of gratitude for an out-of-town interview?
What is a simple, physical situation where complex numbers emerge naturally?
Bent spoke design wheels — feasible?
How to make thick Asian sauces?
My ESTA has been refused
PhD student with mental health issues and bad performance
Old black and white movie: glowing black rocks slowly turn you into stone upon touch
Explain Ant-Man's "not it" scene from Avengers: Endgame
Building a road to escape Earth's gravity by making a pyramid on Antartica
Why were the Night's Watch required to be celibate?
Pronoun introduced before its antecedent
What's the correct term for a waitress in the Middle Ages?
Linux tr to convert vertical text to horizontal
Why do guitarists wave their guitars?
What is the right way to float a home lab?
what is triplication on fpga?
Can we use the verb "says" for advertisement?
Why don't B747s start takeoffs with full throttle?
What flavor of zksnark in tezos
What happened to all the nuclear material being smuggled after the fall of the USSR?
California: "For quality assurance, this phone call is being recorded"
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 8 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 8 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 8 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 8 hours ago
fsocietyfsociety
498521
asked 8 hours ago
fsocietyfsociety
498521
asked 8 hours ago
fsocietyfsociety
498521
asked 8 hours ago
fsocietyfsociety
498521
asked 8 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 8 hours ago
Teun Vink♦Teun Vink
12.2k53354
add a comment |
Your Answer
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "496"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fnetworkengineering.stackexchange.com%2fquestions%2f59526%2fregarding-ebgp-multipath%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
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 8 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 8 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 8 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 8 hours ago
Teun Vink♦Teun Vink
12.2k53354
answered 8 hours ago
Teun Vink♦Teun Vink
12.2k53354
answered 8 hours ago
Teun Vink♦Teun Vink
12.2k53354
answered 8 hours ago
Teun Vink♦Teun Vink
12.2k53354
12.2k53354
add a comment |
add a comment |
Thanks for contributing an answer to Network Engineering Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fnetworkengineering.stackexchange.com%2fquestions%2f59526%2fregarding-ebgp-multipath%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
