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Why Should I Care That Fully Meshed Peering Leads to Exponential Growth of Total Connections?

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Why Should I Care That Fully Meshed Peering Leads to Exponential Growth of Total Connections?

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3

It seems that when I see a description of a fully-meshed peering system, the exponential growth of peer connections is often referred to as a negative.

However, some mentions of this were specifically towards fully meshed peering in an AWS VPC specifically.

Surely, if connections between peers is done entirely automatically, and the amount of connections for any individual VPC increases linearly, then this shouldn't be an issue?

cloud

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RecyclingBenRecyclingBen

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  Do you have a specific problem?
  
  – Zac67
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Zac67 I am considering using a fully meshed set of VPCs for a specific project I'm working on, and I'm not sure why having a large amount of connections is bad per se, when everything can be scaled automatically. (Sorry if I'm using incorrect terminology, I'm not a networking guy).
  
  – RecyclingBen
  7 hours ago
  

  
  
  
  

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3

It seems that when I see a description of a fully-meshed peering system, the exponential growth of peer connections is often referred to as a negative.

However, some mentions of this were specifically towards fully meshed peering in an AWS VPC specifically.

Surely, if connections between peers is done entirely automatically, and the amount of connections for any individual VPC increases linearly, then this shouldn't be an issue?

cloud

share|improve this question

asked 8 hours ago

RecyclingBenRecyclingBen

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RecyclingBen is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do you have a specific problem?
  
  – Zac67
  8 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Zac67 I am considering using a fully meshed set of VPCs for a specific project I'm working on, and I'm not sure why having a large amount of connections is bad per se, when everything can be scaled automatically. (Sorry if I'm using incorrect terminology, I'm not a networking guy).
  
  – RecyclingBen
  7 hours ago
  

  
  
  
  

add a comment
 | 

It seems that when I see a description of a fully-meshed peering system, the exponential growth of peer connections is often referred to as a negative.

However, some mentions of this were specifically towards fully meshed peering in an AWS VPC specifically.

Surely, if connections between peers is done entirely automatically, and the amount of connections for any individual VPC increases linearly, then this shouldn't be an issue?

cloud

share|improve this question

asked 8 hours ago

RecyclingBenRecyclingBen

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1

By exponentially increasing the the number of connections, you also exponentially increase the amount of control traffic, and you could end up with the control traffic using most or all of the available bandwidth of the system.

Some protocols will have mitigations for this behavior. For example, OSPF uses the DR/BDR to break the exponential number of connections, and iBGP can use route reflectors or confederations to do something similar.

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answered 8 hours ago

Ron Maupin♦Ron Maupin

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In addition to Ron’s point about the amount of control traffic: The additional cpu load resulting from processing route updates on every router often isn’t worth it either when your network grows. You don’t want every router in your network to do that, that’s where for example route reflectors come in. Having many routers processing route updates can lead to nasty routing inconsistencies if not all routers process updates equally fast.

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Teun Vink♦Teun Vink

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1

By exponentially increasing the the number of connections, you also exponentially increase the amount of control traffic, and you could end up with the control traffic using most or all of the available bandwidth of the system.

Some protocols will have mitigations for this behavior. For example, OSPF uses the DR/BDR to break the exponential number of connections, and iBGP can use route reflectors or confederations to do something similar.

share|improve this answer

answered 8 hours ago

Ron Maupin♦Ron Maupin

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add a comment
 | 

1

By exponentially increasing the the number of connections, you also exponentially increase the amount of control traffic, and you could end up with the control traffic using most or all of the available bandwidth of the system.

Some protocols will have mitigations for this behavior. For example, OSPF uses the DR/BDR to break the exponential number of connections, and iBGP can use route reflectors or confederations to do something similar.

share|improve this answer

answered 8 hours ago

Ron Maupin♦Ron Maupin

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add a comment
 | 

By exponentially increasing the the number of connections, you also exponentially increase the amount of control traffic, and you could end up with the control traffic using most or all of the available bandwidth of the system.

Some protocols will have mitigations for this behavior. For example, OSPF uses the DR/BDR to break the exponential number of connections, and iBGP can use route reflectors or confederations to do something similar.

share|improve this answer

answered 8 hours ago

Ron Maupin♦Ron Maupin

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share|improve this answer

answered 8 hours ago

Ron Maupin♦Ron Maupin

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answered 8 hours ago

Ron Maupin♦Ron Maupin

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answered 8 hours ago

Ron Maupin♦Ron Maupin

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2

In addition to Ron’s point about the amount of control traffic: The additional cpu load resulting from processing route updates on every router often isn’t worth it either when your network grows. You don’t want every router in your network to do that, that’s where for example route reflectors come in. Having many routers processing route updates can lead to nasty routing inconsistencies if not all routers process updates equally fast.

share|improve this answer

answered 6 hours ago

Teun Vink♦Teun Vink

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add a comment
 | 

2

In addition to Ron’s point about the amount of control traffic: The additional cpu load resulting from processing route updates on every router often isn’t worth it either when your network grows. You don’t want every router in your network to do that, that’s where for example route reflectors come in. Having many routers processing route updates can lead to nasty routing inconsistencies if not all routers process updates equally fast.

share|improve this answer

answered 6 hours ago

Teun Vink♦Teun Vink

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add a comment
 | 

In addition to Ron’s point about the amount of control traffic: The additional cpu load resulting from processing route updates on every router often isn’t worth it either when your network grows. You don’t want every router in your network to do that, that’s where for example route reflectors come in. Having many routers processing route updates can lead to nasty routing inconsistencies if not all routers process updates equally fast.

share|improve this answer

answered 6 hours ago

Teun Vink♦Teun Vink

12.7k55 gold badges3535 silver badges5858 bronze badges

share|improve this answer

answered 6 hours ago

Teun Vink♦Teun Vink

12.7k55 gold badges3535 silver badges5858 bronze badges

answered 6 hours ago

Teun Vink♦Teun Vink

12.7k55 gold badges3535 silver badges5858 bronze badges

answered 6 hours ago

Teun Vink♦Teun Vink

12.7k55 gold badges3535 silver badges5858 bronze badges