N7K-M132XP-12 Ports @ Line Rate

[Carlos Aguinaldo]

Hi All,

If I only have 4 ports active on this line card, say ports 2, 10, 9 and 17, which are all first ports in each group. Will those be able to forward traffic at line rate 10Gig without the rate-mode dedicated force command? Based on the documentation below, it seems that the first port in each group will only be able to forward at line rate in dedicated mode. That is, the rate-mode dedicated force command needs to be explicitly configured even though other ports in the group are unused.

http://www.cisco.com/c/en/us/support/docs/interfaces-modules/nexus-7000-m1-series-32-port-10gb-ethernet-module/116262-problemsolution-product-00.html

Thanks in advance.

Carlos

[Reza Sharifi · Accepted solution]

Hi Carlos,

That is correct.  I believe you have to configure each group specifically for dedicated mode as by default they are in shared mode.

HTH

[Carlos Aguinaldo]

Thanks Reza. I had the same question on another thread and actually got a different answer. That is, rate-mode dedicated force is not mandatory if other ports on the same group are not used/disabled.

https://supportforums.cisco.com/discussion/13326346/rate-mode-dedicated-force

"If for example, you only had the 4 ports active you listed above and didn't configure "rate-mode dedicated force" on any port, then essentially you're sharing 10GB bandwidth across all 4 ports in the same port group. However since you only have one active connection in each port group, then essentially that port is getting the full 10GB anyway (i.e. same behaviour as the command "rate-mode dedicted force" would've given you)"

Would you know if this can be verified on the CLI? Doing a show interface Ethx/x still shoes 10Gbps no matter what mode the port is configured for.

[Reza Sharifi]

Carlos,

Can you try:

"sh int ex/x capa"

HTH

[Carlos Aguinaldo]

Sure, here you go.

N7K3# sh int e5/2 capa

Ethernet5/2
Model: N7K-M132XP-12
Type (SFP capable): 10Gbase-SR
Speed: 10000
Duplex: full
Trunk encap. type: 802.1Q
FabricPath capable: no
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off/on),tx-(off/on)
Rate mode: dedicated/shared
Port mode: Routed,Switched
QOS scheduling: rx-(8q2t),tx-(1p7q4t)
CoS rewrite: yes
ToS rewrite: yes
SPAN: yes
UDLD: yes
MDIX: no
TDR capable: no
Link Debounce: yes
Link Debounce Time: yes
FEX Fabric: yes
dot1Q-tunnel mode: yes
Pvlan Trunk capable: yes
Port Group Members: 2,4,6,8
EEE (efficient-eth): no
PFC capable: no

N7K3# sh int status | i 5/
Eth5/2 -- connected trunk full 10G 10Gbase-SR
Eth5/4 -- sfpAbsent routed full auto --
Eth5/6 -- sfpAbsent routed full auto --
Eth5/8 -- sfpAbsent routed full auto --
Eth5/10 -- connected trunk full 10G 10Gbase-SR
Eth5/12 -- sfpAbsent routed full auto --
Eth5/14 -- sfpAbsent routed full auto --
Eth5/16 -- sfpAbsent routed full auto --
Eth5/18 -- sfpAbsent routed full auto --
Eth5/20 -- sfpAbsent routed full auto --
Eth5/22 -- sfpAbsent routed full auto --
Eth5/24 -- sfpAbsent routed full auto --
Eth5/26 -- sfpAbsent routed full auto --
Eth5/28 -- sfpAbsent routed full auto --
Eth5/30 -- sfpAbsent routed full auto --
Eth5/32 -- sfpAbsent routed full auto --

However, I see the same output in a shared port.

N7K3# sh int e8/26 capa
Ethernet8/26
Model: N7K-M132XP-12
Type (SFP capable): 10Gbase-SR
Speed: 10000
Duplex: full
Trunk encap. type: 802.1Q
FabricPath capable: no
Channel: yes

N7K3# sh run int e8/26

!Command: show running-config interface Ethernet8/26
!Time: Wed Jul 5 20:53:09 2017

version 6.1(2)

interface Ethernet8/26
switchport
switchport mode trunk
no shutdown

[Reza Sharifi]

Thanks for the output.

So, I only see this line:

"Rate mode: dedicated/shared"

for port e5/2 and not for e8/26

Is that correct?

Maybe because e8/26 can't be configure with rate mode command.

reza

[Carlos Aguinaldo]

Sorry, I cut the output for 8/26 since I only focused on the speed. They look the same to me.

N7K3# sh int e8/26 capa
Ethernet8/26
Model: N7K-M132XP-12
Type (SFP capable): 10Gbase-SR
Speed: 10000
Duplex: full
Trunk encap. type: 802.1Q
FabricPath capable: no
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off/on),tx-(off/on)
Rate mode: dedicated/shared
Port mode: Routed,Switched
QOS scheduling: rx-(8q2t),tx-(1p7q4t)
CoS rewrite: yes
ToS rewrite: yes
SPAN: yes
UDLD: yes
MDIX: no
TDR capable: no
Link Debounce: yes
Link Debounce Time: yes
FEX Fabric: yes
dot1Q-tunnel mode: yes
Pvlan Trunk capable: yes
Port Group Members: 26,28,30,32
EEE (efficient-eth): no
PFC capable: no

I wonder if the primary port can forward 10Gig in shared mode if the other ports are disabled.

[Reza Sharifi]

Carlos,

I would try the rate-mode dedicated force command and than issue the output again. I still think the default is shared mode.

see the config guide for more info

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/interfaces/configuration/guide/if_cli/if_basic.html

HTH