With respect to Juniper Networks , what is the difference between 'Fabric Plane and 'Switch Fabric'?
I am struggling with the concept of 'Fabric Plane' and 'Switch Fabric'? I haven't found any clear cut difference between them? Why fabric planes are different in MX960 compared with MX240 and MX480. How SCB effect throughput?
I am quoting the paragraph from the book Juniper Book MX series:
The MX240 and MX480 support two SCBs for a total of four switch
fabrics and eight fabric planes. The MX960 supports three SCBs for a
total of six switch fabrics and six fabric planes.
This begs the question, what is a fabric plane? Think of the switch
fabric as a fixed unit that can support N connections. When supporting
48 PFEs on the MX960, all of these connections on the switch fabric
are completely consumed. Now think about what happens when you apply
the same logic to the MX480. Each switch fabric now only has to
support 24 PFEs, thus half of the connections aren’t being used. What
happens on the MX240 and MX480 is that these unused connections are
grouped together and another plane is created so that the unused
connections can now be used. The benefit is that the MX240 and MX480
only require a single SCB to provide line rate throughput, thus only
require an additional SCB for 1 + 1 SCB redundancy.
I will be very happy if someone explain it. Many Thanks
router juniper
edited 34 mins ago
Ron Maupin♦
62.9k1365120
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
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I am struggling with the concept of 'Fabric Plane' and 'Switch Fabric'? I haven't found any clear cut difference between them? Why fabric planes are different in MX960 compared with MX240 and MX480. How SCB effect throughput?
I am quoting the paragraph from the book Juniper Book MX series:
The MX240 and MX480 support two SCBs for a total of four switch
fabrics and eight fabric planes. The MX960 supports three SCBs for a
total of six switch fabrics and six fabric planes.
This begs the question, what is a fabric plane? Think of the switch
fabric as a fixed unit that can support N connections. When supporting
48 PFEs on the MX960, all of these connections on the switch fabric
are completely consumed. Now think about what happens when you apply
the same logic to the MX480. Each switch fabric now only has to
support 24 PFEs, thus half of the connections aren’t being used. What
happens on the MX240 and MX480 is that these unused connections are
grouped together and another plane is created so that the unused
connections can now be used. The benefit is that the MX240 and MX480
only require a single SCB to provide line rate throughput, thus only
require an additional SCB for 1 + 1 SCB redundancy.
I will be very happy if someone explain it. Many Thanks
router juniper
edited 34 mins ago
Ron Maupin♦
62.9k1365120
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
111
New contributor
NABEEL NASIR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I am struggling with the concept of 'Fabric Plane' and 'Switch Fabric'? I haven't found any clear cut difference between them? Why fabric planes are different in MX960 compared with MX240 and MX480. How SCB effect throughput?
I am quoting the paragraph from the book Juniper Book MX series:
The MX240 and MX480 support two SCBs for a total of four switch
fabrics and eight fabric planes. The MX960 supports three SCBs for a
total of six switch fabrics and six fabric planes.
This begs the question, what is a fabric plane? Think of the switch
fabric as a fixed unit that can support N connections. When supporting
48 PFEs on the MX960, all of these connections on the switch fabric
are completely consumed. Now think about what happens when you apply
the same logic to the MX480. Each switch fabric now only has to
support 24 PFEs, thus half of the connections aren’t being used. What
happens on the MX240 and MX480 is that these unused connections are
grouped together and another plane is created so that the unused
connections can now be used. The benefit is that the MX240 and MX480
only require a single SCB to provide line rate throughput, thus only
require an additional SCB for 1 + 1 SCB redundancy.
I will be very happy if someone explain it. Many Thanks
router juniper
edited 34 mins ago
Ron Maupin♦
62.9k1365120
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
111
New contributor
NABEEL NASIR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am struggling with the concept of 'Fabric Plane' and 'Switch Fabric'? I haven't found any clear cut difference between them? Why fabric planes are different in MX960 compared with MX240 and MX480. How SCB effect throughput?
I am quoting the paragraph from the book Juniper Book MX series:
The MX240 and MX480 support two SCBs for a total of four switch
fabrics and eight fabric planes. The MX960 supports three SCBs for a
total of six switch fabrics and six fabric planes.
This begs the question, what is a fabric plane? Think of the switch
fabric as a fixed unit that can support N connections. When supporting
48 PFEs on the MX960, all of these connections on the switch fabric
are completely consumed. Now think about what happens when you apply
the same logic to the MX480. Each switch fabric now only has to
support 24 PFEs, thus half of the connections aren’t being used. What
happens on the MX240 and MX480 is that these unused connections are
grouped together and another plane is created so that the unused
connections can now be used. The benefit is that the MX240 and MX480
only require a single SCB to provide line rate throughput, thus only
require an additional SCB for 1 + 1 SCB redundancy.
I will be very happy if someone explain it. Many Thanks
router juniper
router juniper
edited 34 mins ago
Ron Maupin♦
62.9k1365120
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
111
New contributor
NABEEL NASIR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 34 mins ago
Ron Maupin♦
62.9k1365120
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
111
New contributor
NABEEL NASIR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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edited 34 mins ago
Ron Maupin♦
62.9k1365120
edited 34 mins ago
Ron Maupin♦
62.9k1365120
edited 34 mins ago
Ron Maupin♦
62.9k1365120
62.9k1365120
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
111
New contributor
NABEEL NASIR is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
111
asked 1 hour ago
NABEEL NASIRNABEEL NASIR
111
111
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1 Answer
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The wording in that document isn't great - IMO it should read
What happens on the MX240 and MX480 is that these unused connections are grouped together and another fabric is created so that the unused connections can now be used
However Juniper terminology-wise, the switch fabric really equates to the sum of all fabric planes.
This diagram may explain it a little better (retrieved from https://kb.juniper.net/InfoCenter/index?page=content&id=KB23065):
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
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1 Answer
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active
oldest
votes
The wording in that document isn't great - IMO it should read
What happens on the MX240 and MX480 is that these unused connections are grouped together and another fabric is created so that the unused connections can now be used
However Juniper terminology-wise, the switch fabric really equates to the sum of all fabric planes.
This diagram may explain it a little better (retrieved from https://kb.juniper.net/InfoCenter/index?page=content&id=KB23065):
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
add a comment |
The wording in that document isn't great - IMO it should read
What happens on the MX240 and MX480 is that these unused connections are grouped together and another fabric is created so that the unused connections can now be used
However Juniper terminology-wise, the switch fabric really equates to the sum of all fabric planes.
This diagram may explain it a little better (retrieved from https://kb.juniper.net/InfoCenter/index?page=content&id=KB23065):
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
add a comment |
The wording in that document isn't great - IMO it should read
What happens on the MX240 and MX480 is that these unused connections are grouped together and another fabric is created so that the unused connections can now be used
However Juniper terminology-wise, the switch fabric really equates to the sum of all fabric planes.
This diagram may explain it a little better (retrieved from https://kb.juniper.net/InfoCenter/index?page=content&id=KB23065):
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
The wording in that document isn't great - IMO it should read
What happens on the MX240 and MX480 is that these unused connections are grouped together and another fabric is created so that the unused connections can now be used
However Juniper terminology-wise, the switch fabric really equates to the sum of all fabric planes.
This diagram may explain it a little better (retrieved from https://kb.juniper.net/InfoCenter/index?page=content&id=KB23065):
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
answered 35 mins ago
Benjamin DaleBenjamin Dale
6,5491036
6,5491036
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