Re: Cisco Nexus oversubscription question

One point to remember in shared mode. A single port can use all 10G if
other shared ports aren't utilized. A shared port can use more than 2.5 G.
In situation where all shared ports are over subscribed the ratio would be
similar to Joe's 10/4 calculation. Please reference documentation if I am
off but I do remember visiting this a while back

On Monday, March 4, 2013, Joe Sanchez wrote:

> Jamal, the M132 has a 4/1 ratio which means 1,3,5,7 share a 10g. Each
> port would be limited to 2.5g max regardless of the access rate or SFP
> speed being set at 10g. If you want full line rate you will have to put
> port 1 in mode dedicated and ports 3,5,7 will automatically be forced down.
> Newer models support full line rate 10g on all ports if they came out, not
> sure if the 48p 10g M2 modules came out or not.
>
> Regards,
> Joe Sanchez
>
> ( please excuse the brevity of this email as it was sent via a mobile
> device. Please excuse misspelled words or sentence structure.)
>
> On Mar 4, 2013, at 5:57 AM, Naufal Jamal <naufalccie_at_yahoo.in<javascript:;>>
> wrote:
>
> > Hi,
> >
> > I have a nexus 7K with module N7K-M132XP-12L. This module has 32 10G
> > ports but can give you only 80G throughput from the card since the ports
> are
> > in shared mode. So that means i will have a port-group of 1,3,5,7 and
> can use
> > either one of them with full 10G capacity or use 4 of them sharing 10G
> among.
> > Lets see a port-group 13/1,13/3,13/5,13/7
> >
> > XYZ# sh int eth13/1 capabilities
> > Ethernet13/1
> > Model: N7K-M132XP-12L
> > Type (SFP capable):
> > 10Gbase-SR
> > Speed: 10000
> > Duplex: full
> >
> > Channel: yes
> > Flowcontrol: rx-(off/on),tx-(off/on)
> >
> > Rate mode: dedicated/shared
> >
> > All other ports in the port-group
> > don't have any SFP connected. We dont have any command saying "rate-mode
> > dedicated" in any of the ports in the port-group.
> >
> > interface Ethernet13/1
> > no
> > switchport
> > channel-group 13 mode active
> > no shutdown
> >
> > port-channel 13 is
> > L3. Does the L2 or L3 really matters when it comes to dedicate/shared
> mode in
> > nexus?
> >
> > Is 13/1 getting the complete dedicated 10G wire speed even if we
> > havent explicitly configured rate-mode in any of the ports?
> >
> > what happens if i
> > connect anything to 13/3 does the 10G gets divided into 2 ports
> automatically?
> > Just want to check without configuring the rate-mode in any of the ports
> does
> > 10G gets allocated to a single port automatically given that the rest of
> the
> > ports in the group are disabled?
> >
> >
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> >
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