Port-Channel configuration

[Jerome C.]

Hi,

On my network, I have a stack with 2 C3850-12s (12 x 1Gbps sfp). This Core stack is connected to our access stack based on 2xC9200L-48P-4x (switch with 10Gbps module). From the 1st member of c3850-12s, I have 2 physical links connected to the first 9200L member (on port 10gpbs) and I have 2 physical links from the secondary c3850-12s to the second 9200L member (on port 10gpbs) . On each stack (c3850 & 9200), I have the following configuration :

Conf on 3850-12s (1Gpbs SFP ports)

!
interface Port-channel5
description uplink 9200L
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
!
interface GigabitEthernet1/0/11
description uplink 9200L
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!
interface GigabitEthernet1/0/12
description uplink 9200L
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!
interface GigabitEthernet2/0/11
description uplink 9200L
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!
interface GigabitEthernet2/0/12
description uplink 9200L
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!

Conf on C9200L (10Gbps sfp ports)
!
interface Port-channel5
description uplink c3850-12s
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
!
interface TenGigabitEthernet1/1/1
description uplink c3850-12s
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!
interface TenGigabitEthernet1/1/2
description uplink c3850-12s
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!
interface TenGigabitEthernet2/1/1
description uplink c3850-12s
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!
interface TenGigabitEthernet2/1/2
description uplink c3850-12s
switchport mode trunk
switchport trunck allowed vlan xxx,xxx,xxx
switchport nonegotiate
logging event trunk-status
storm-control broadcast level bps 25m
storm-control multicast level bps 25m
channel-group 5 mode active
!

Is the configuration is correct and optimized ? Sometime, I read these parameters : storm-control broadcast level 10.00 &storm-control multicast level 10.00. What is your opinion and in my case, which configuration should be better ?

BR

[Leo Laohoo]

---

@Jerome C. wrote:
(12 x 1Gbps sfp)
(switch with 10Gbps module)

---

One side has SFP and another side has SFP+? 

Not going to work.

[Jerome C.]

Sorry for the confusion. On each stack, I use sfp module.

BR

[Leo Laohoo]

---

@Jerome C. wrote:
On each stack, I use sfp module.

---

Are both ends using the same SFP (not SFP+) and the same wavelength?

[Georg Pauwen]

Hello,

I would say the configurations look by the book. The storm control levels for broadcast and multicast traffic (you have 25Mbps configured) depend very much on the traffic patterns in your network. With 25Mbps configured on 10G links, I would guess there is little to no multicast traffic ?

[Jerome C.]

Currently, we have only 1Gbps link between switches not 10gbps even if we have module on 9200L supported 10Gbps link. But at the moment, only sfp on both equipment (c3850  & 9200) connected with FO

BR 

[Georg Pauwen]

Hello,

even for 1Gbps links, the broadcast/multicast level is very low. I was just mentioning this in case you are actually using multicast in your network.

[Jerome C.]

Hello

I'm newer employee on the company but for me, there is no multicast usage on the network...

[MHM Cisco World]

storm control depend on your traffic 
second sure one Port-channel will be STP BLK status. 

[Joseph W. Doherty]

Any kind of storm-control should be used with much care, because a) it can drop legitimate traffic (when there really not cause to do so) and b) it's basically designed as a "last resort" (I consider it like circa 1860 war surgery, we need to amputate your limb to save your life). 

[Joseph W. Doherty]

Also . . .

"Is the configuration is . . . optimized ?"

Not set directly on the interfaces, is the load balancing algorithm choice.  That should be chosen to be optimal for your traffic.  Likely, your devices default to src-dst-IP, which is often, but not always, the "best" choice.