11-22-2013 10:49 PM - edited 03-07-2019 04:45 PM
Hi All,
Can somemone help me understand the speed coloun of the below output, It denotes "S" & "D" beside auto. I woud like to understand what it actually refers to.
switch# show interface brief
--------------------------------------------------------------------------------
Ethernet VLAN Type Mode Status Reason Speed Port
Interface Ch #
--------------------------------------------------------------------------------
Eth2/1 -- eth routed down Administratively down auto(D) --
Eth2/2 -- eth routed down Administratively down auto(D) --
Eth2/3 -- eth routed down Administratively down auto(S) --
Eth2/4 1 eth pvlan down Administratively down auto(D) --
Eth2/5 -- eth routed down Administratively down auto(S) --
Eth2/6 1 eth access down Link not connected auto(D) --
Eth2/7 1 eth access up none 1000(S) --
Eth2/8 -- eth routed down Administratively down auto(D) --
Eth2/9 1 eth access up none 1000(D) --
Thanks to all in advance!
Sagar
Solved! Go to Solution.
11-23-2013 01:26 AM
Hi Sagar,
Some I/O modules on the Nexus have over-subscribed capacity between the ports and the switch fabric e.g., the N7K-M132XP-12 has 320Gbps (32*10GE) worth of port capacity but only 80Gbps of switch fabric capacity, so an over-subscription of 4:1.
On these modules the way the capacity is shared is with the ports being split into a number of port-groups. On the aforementioned N7K-M132XP-12 module we have port groups with interfaces {1,3,5,7}, {2,4,6,8}, {9,11,13,15}, {10,12,14,16} etc., sharing the available fabric bandwidth. You're able to determine which ports are part of the same port-group with the show interface
For the M1 32 module the default operation is that the fabric bandwidth is shared between all members of the port-group, but the switch can be configured such that a single port of the group has full fabric capacity available to it i.e., the capacity is dedicated to that one port. This is configured using the rate-mode dedicated command within interface context. Note though that when this command is configured there's only one port of the group active so if you configure port 1 as dedicated then ports 3, 5 and 7 can no longer be used.
So what I think you're seeing in the show interfaces brief output is an indication of whether the interface is operating in Dedicated (D) and Shared (S) mode. Can you paste the output of the show interface capabilities | include "^Ethernet|Model|Port Group" and then we can see what I/O modules you have and so understand whether this is the case.
Regards
11-23-2013 01:26 AM
Hi Sagar,
Some I/O modules on the Nexus have over-subscribed capacity between the ports and the switch fabric e.g., the N7K-M132XP-12 has 320Gbps (32*10GE) worth of port capacity but only 80Gbps of switch fabric capacity, so an over-subscription of 4:1.
On these modules the way the capacity is shared is with the ports being split into a number of port-groups. On the aforementioned N7K-M132XP-12 module we have port groups with interfaces {1,3,5,7}, {2,4,6,8}, {9,11,13,15}, {10,12,14,16} etc., sharing the available fabric bandwidth. You're able to determine which ports are part of the same port-group with the show interface
For the M1 32 module the default operation is that the fabric bandwidth is shared between all members of the port-group, but the switch can be configured such that a single port of the group has full fabric capacity available to it i.e., the capacity is dedicated to that one port. This is configured using the rate-mode dedicated command within interface context. Note though that when this command is configured there's only one port of the group active so if you configure port 1 as dedicated then ports 3, 5 and 7 can no longer be used.
So what I think you're seeing in the show interfaces brief output is an indication of whether the interface is operating in Dedicated (D) and Shared (S) mode. Can you paste the output of the show interface capabilities | include "^Ethernet|Model|Port Group" and then we can see what I/O modules you have and so understand whether this is the case.
Regards
11-25-2013 05:46 AM
Ethernet3/1
Model: N7K-M132XP-12L
Type (SFP capable): 10Gbase-(unknown)
Speed: 10000
Duplex: full
Trunk encap. type: 802.1Q
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off/on),tx-(off/on)
Rate mode: dedicated/shared
QOS scheduling: rx-(8q2t),tx-(1p7q4t)
CoS rewrite: yes
ToS rewrite: yes
SPAN: yes
UDLD: yes
Link Debounce: yes
Link Debounce Time: yes
MDIX: no
Pvlan Trunk capable: yes
Port Group Members: 1,3,5,7
TDR capable: no
FabricPath capable: no
Port mode: Routed,Switched
FEX Fabric: yes
dot1Q-tunnel mode: yes
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