Calculating switch performance

HI all,
When we see any performance of switch, it is usually given in PPS and switch fabric is also given.
For e.g Cisco 3750 24 port switch has switching performance of 6,500,000 (PPS) and switching fabric of 32 Gbps.
I would like to know how this two figures are interelated?
Thanks,
Niraj.

Hi Niraj,
The switching fabric capacity is the actual forwarding capacity of the switch fabric and provides an upper bound on the throughout possible. The switching performance, on the other hand, is the maximum forwarding rate that has been achieved on the platform by Cisco testing. This forwarding rate will usually be limited by the CPU capacity of the switch etc. That is why you see switches with the same switching performance but different switch fabric capacity.
Hope that helps - pls rate the post if it does.
Paresh

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  • Peer switch feature for L2 legacy switch

    Hi,
    Please i'm looking for the practical usage of peer-switch feature enable on both NX5K parent switch specialy when we have a mixed access layer build with FEXs and L2 LAN switch uplinked with LACP etherchannel.
    Is there any recommendation when we use the peer-switch and peer-gateway on the both NX5K parent switch performing L3/FRHP with HSRP and L2 root bridge role for the Legacy LAN.
    Thanks. 

    Greets,
    That is a really well thought out question, took me a couple of reads to realise what you were asking.
    Both switches generate BPDUs with the same Priority/MAC for vPC interfaces, however the behaviour is not the same on non-vPC interfaces.  The reason is pretty simple, the edge switch WILL block one of the two links, if it has to come down to Port ID as the descriminator it will happily do so.  So if both switches send identical BPDUs, the one with the lowest port ID will always end up being the root, while the second port is blocking.  If this behaviour is replicated for all VLANs, you have one link taking all traffic from the edge switch.
    To avoid this we have a concept of "psuedo information" that means on vPC interfaces we advertise the same priority, however on non-vPC interfaces we can advertise two different priorities (on a per instance/VLAN basis).  So you can have the link to SW1 being the root for VLAN X, while SW2 the root for VLAN Y.  So while peer-switch provides additional flexibility to load balance per STP instance over the two links, it will not really help you in this failure scenario.
    The problem with having your host dual homed but using standalone links, is from a logical perspective it is still an orphan port (as we will always block on one of the two ports).  Although I can't see any situation where you would have a dual homed host, but it not be in a vPC, so it is kind of a corner case.
    HTH
    Chris

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