02-05-2014 11:00 PM - edited 03-07-2019 06:02 PM
Hello all.
I am supposed to fill an excel sheet with information on some Cisco switch models, i understand most of the terms but i have some which i do not understand, can someone help me on the meaning and examples ( in reference to the WS-C3750X-48P-L model or any similar model ) of the following:
CVR/X2 MODULE SUPPORT
REQUIRED IOS FOR IPV6 SUPPORT
|
Solved! Go to Solution.
02-06-2014 12:05 AM
CVR is a twingig module converting each 10 Gig X2 interface into two Gig SFP ports.
CVR-X2-SFP | TwinGig Converter Module |
IPv6 support for 3750-x is from 12.2(53)SE2 and upwards according to feature navigator.
GBIC is not used for 3750 to the best of my knowledge. It is an legacy interface.
http://www.cisco.com/en/US/tech/tk389/tk214/technologies_tech_note09186a0080094863.shtml#cat3750k
Wire speed means if the interface can transmit/receive at the physical speed. So if interface is Gigabit it should be able to transmit/receive at full speed.
Stacking capacity is how much traffic can be sent via backplane through stacking cable. Catalyst 3750-x has 16 Gbps per stacking cable which is 32 Gbps in each direction for a ring or 64 Gbps if talking about fully utilized on both directions.
Post edited after input from Joseph.
Daniel Dib
CCIE #37149
Please rate helpful posts.
02-06-2014 12:05 AM
CVR is a twingig module converting each 10 Gig X2 interface into two Gig SFP ports.
CVR-X2-SFP | TwinGig Converter Module |
IPv6 support for 3750-x is from 12.2(53)SE2 and upwards according to feature navigator.
GBIC is not used for 3750 to the best of my knowledge. It is an legacy interface.
http://www.cisco.com/en/US/tech/tk389/tk214/technologies_tech_note09186a0080094863.shtml#cat3750k
Wire speed means if the interface can transmit/receive at the physical speed. So if interface is Gigabit it should be able to transmit/receive at full speed.
Stacking capacity is how much traffic can be sent via backplane through stacking cable. Catalyst 3750-x has 16 Gbps per stacking cable which is 32 Gbps in each direction for a ring or 64 Gbps if talking about fully utilized on both directions.
Post edited after input from Joseph.
Daniel Dib
CCIE #37149
Please rate helpful posts.
02-06-2014 02:44 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Stacking capacity is how much traffic can be sent via backplane through stacking cable. Catalyst 3750-x has 32 Gbps per stacking cable which is 64 Gbps in each direction or 128 Gbps in marketing speak.
My understanding of the StackWise Plus, it offers just 64 Gbps across both stack ports. Cisco's "marketing speak" usually describes StackWise as having 32 Gbps and StackWise Plus 64 Gbps. Also from your reference:
Technology Overview
Cisco StackWise technology provides an innovative new method for collectively utilizing the capabilities of a stack of switches. Individual switches intelligently join to create a single switching unit with a 32-Gbps switching stack interconnect. Configuration and routing information is shared by every switch in the stack, creating a single switching unit. Switches can be added to and deleted from a working stack without affecting performance.
StackWise Plus
StackWise Plus is an evolution of StackWise. StackWise Plus is only supported on the Cisco Catalyst 3750-E and Catalyst 3750-X switch families. The two main differences between StackWise Plus and StackWise are as follows:
1. For unicast packets, StackWise Plus supports destination striping, unlike StackWise support of source stripping. Figure 9 shows a packet is being sent from Switch 1 to Switch 2. StackWise uses source stripping and StackWise Plus uses destination stripping. Source stripping means that when a packet is sent on the ring, it is passed to the destination, which copies the packet, and then lets it pass all the way around the ring. Once the packet has traveled all the way around the ring and returns to the source, it is stripped off of the ring. This means bandwidth is used up all the way around the ring, even if the packet is destined for a directly attached neighbor. Destination stripping means that when the packet reaches its destination, it is removed from the ring and continues no further. This leaves the rest of the ring bandwidth free to be used. Thus, the throughput performance of the stack is multiplied to a minimum value of 64 Gbps bidirectionally. This ability to free up bandwidth is sometimes referred to as spatial reuse. Note: even in StackWise Plus broadcast and multicast packets must use source stripping, because the packet may have multiple targets on the stack.
This I've taken to mean, the bidirectional bandwidth of the pair of StackWise Pluse stack cables is 32 Gbps, duplex, and that each stack port is 16 Gbps, duplex.
Regarding the "minimum value", this is in reference to StackWise Plus's "spatial reuse", which allows a stack ring, of more than two members, to increase its aggregate bandwidth. More details of this can be found in (Cisco's) RFC 2892.
02-06-2014 03:52 AM
Thanks for clearing that up Joseph, I have edited my post.
Daniel Dib
CCIE #37149
Please rate helpful posts.
02-18-2014 02:12 AM
Hello Daniel.
The link on the Cisco website to see the switch models that support TwinGig is not available, i wanted to see if the 3750X series switches have support for TwinGig modules. Can you please help?
regards.
02-18-2014 02:45 AM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
The link on the Cisco website to see the switch models that support TwinGig is not available, i wanted to see if the 3750X series switches have support for TwinGig modules. Can you please help?regards.
No it does not. First the 3750X uses SPF or SPF+ (with 10G fiber module), not X2. Second, since SPF+ will run at gig or 10g, there's really not a need.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide