Thoughs on interconnecting Nexus 3548 and 3750 switches

Hi,
I have two nexus 3548 switches.
I have created port-group 1 on both switches to group eth1/47 with eth1/48.
I have 4 sfps, 2 per switch. to connect to a single 3750 that I want to group together as well.
So I have gi1/0/31 going to eth1/1 on nexus1 and gi1/0/32 going to eth1/2 on nexus1
I have gi1/0/33 goin to eth1/1 on nexus2 and gi1/0/32 goin to eth1/2 on nexus2
When I create the port group on the 3750 do I create one group with all 4 ports or will I have to create 2, one per nexus switch?
Thanks

Thanks for the replies. I finally got to test the hardware and config yesterday.
Just so I am clear. the vpc and peer to peer links are only for interconnecting the two Nexus switches. I think I got that right. sho VPC br seems to say it is up. I am using Po5
vPC domain id : 1
Peer status : peer adjacency formed ok
vPC keep-alive status : peer is alive
Configuration consistency status : success
Per-vlan consistency status : success
Type-2 consistency status : success
vPC role : secondary
Number of vPCs configured : 0
Peer Gateway : Disabled
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
Auto-recovery status : Disabled
vPC Peer-link status
id Port Status Active vlans
1 Po5 up 1
Next do I create a port channel on Nex1 and Nex2 for the two ports that connect to the 3750 (Po6 for example) or do I add the two links to the 3750s to Po5 ? I thought I add them to Po 5 but since I am mixing 1000 and 10G ports it doesnt seem to like it.

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How often should the Cisco 6509 and 3750 switches be rebooted? Does Cisco have a best practice recommendation?

How often should the 6509's and 3750's switches be rebooted?
Does Cisco have a best practice document on this and recommendation how long the switch should be up before it gets rebooted?
Why is a reboot needed if there are no indications of issues on the log?

I'd agree with Larry here.
If you're not seeing any issues with your IOS revision and there are no relevant PSIRTs (security notices applicalble to features and or exposure of your device requiring an IOS upgrade) then you can go a very long time without rebooting, if ever.
I'm sure it's far from a record, but our corporate distribution router that supports >1000 downstream devices day in and day out has never been rebooted since installation just over 5 years ago. I have a top of rack Layer 2 switch (2900 series running CatOS) that's almost at 10 years.
That said, you should have some monitoring scheme that assures you everything is healthy. But as long as memory and cpu are happy, the device will run forever.

Cisco LAN Management Solution is required to support Cisco Nexus 5548P and 5596UP switches?

Hi,
Could someone help to know what Cisco LAN Management Solution is required to support Cisco Nexus 5548P switches and Cisco Nexus 5596UP switches?
These new Cisco switches are being implementing on customer network and he ask us that he requires these equipments be supported on a LMS solution (customer currently is using LMS 3.2.1)
Can someone help?
Thanks in advanced,
guruiz

Some very limited Nexus support is present in LMS 3.2.1 - see the supported device table here.
To get more complete support, including the 5596UP, they need to upgrade to LMS 4.x (e.g. LMS 4.2.2 is the latest and is sold under the Cisco Prime Infrastructure 1.2 umbrella). The major upgrade from 3.x to 4.x requires purchasing an upgrade license.
Some functions (namely User Tracking ) will not be available on the 5k due to non-support of the requisite MIB on the device. I believe LMS still doesn't let you do VLAN management on 5k's - you need to use DCNM for that if you want to do it from a GUI.
See the table here for LMS 4.2 device support.

Connection between 5508 WLC and 3750-24PS switch

I have to realize a connection between an 5508 WLC and 3750 switch using one SFP cable. I found on Cisco documentation some reference about two different SFP cables.
The first one is CAB-SFP-50CM, but this is used to interconnect two 3560 switches.
The second is SFP-H10GB-CU1M. This one has SFP+ transceivers on both ends which I don’t know if are compatible with the standard SFP ports that can be found both on WLC and switch.
My question is if I can use one of these cables in order to connect my devices, or if you know other one piece SFP cables.
Many thanks

I know that you can use those SFP transceivers, but I want to know if someone tried to use the SFP-H10GB cables for this kind of connection. Because I saw on another vendor website that the SFP+ cables are compatible with standard SFP ports, and I wanted to see if it is the same for Cisco cables too.
Regards

Nexus 3548 Switch doesn't recognize command " vtp mode Server / Client"

Hi Community.
I have a brand new Nexus 3548 switch. And I did the vtp setup:
vtp version 2
vtp password ******
vtp domain *****
Every thing is ok, but If I use the command "vtp mode server" the switch doesn't know that command. Even it doesn't know the "vtp mode" subcommand?
What's the problem ?
Best regards patrick

The Nexus 3548 supports only Transparent mode:
Step 5 vtp mode {transparent| off} Sets the VTP mode to transparent or off.
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3548/sw/layer_2_switching/b_Cisco_N3548_Layer_2_Switching_Config_503A1.pdf
I have no clue why.
Patrick

Fabric with two Nexus-5548 and a brocade switch does not get fabric updates

We have a fabric containing two Nexus 5548 and a Brocade 5000 switch in interop mode 2. When i make changes to the zoning, the first nexus (the fabric principal) and the brocade switch see the zone changes. The second Nexus switch does not see it. There are no error messages but the change just can't be seen. What can i do to find out, what goes wrong ?

Ouch, deprecated is not the word i wanted to read
We are using 5.1(3)N1(1a) on nexus-rz1-a
and 6.0(2)N1(2) on nexus-rz2-a.
The fabric can be seen :
nexus-rz2-a# show fcs ie vsan 10
IE List for VSAN: 10
IE-WWN                   IE     Mgmt-Id Mgmt-Addr (Switch-name)
10:00:00:05:1e:90:57:27 S(Rem) 0xfffc01 10.88.133.110 (bc-san1)
20:0a:00:2a:6a:72:ba:01 S(Loc) 0xfffc1c 10.88.133.105 (nexus-rz2-a)
20:0a:54:7f:ee:7f:dc:01 S(Adj) 0xfffc0b 10.88.133.100 (nexus-rz1-a)
[Total 3 IEs in Fabric]
nexus-rz1-a# show fcs ie vsan 10
IE List for VSAN: 10
IE-WWN                   IE     Mgmt-Id Mgmt-Addr (Switch-name)
10:00:00:05:1e:90:57:27 S(Adj) 0xfffc01 10.88.133.110 (bc-san1)
20:0a:00:2a:6a:72:ba:01 S(Adj) 0xfffc1c 10.88.133.105 (nexus-rz2-a)
20:0a:54:7f:ee:7f:dc:01 S(Loc) 0xfffc0b 10.88.133.100 (nexus-rz1-a)
[Total 3 IEs in Fabric]
I try to distribute the zoneset this way:
zoneset distribute vsan 10
Zoneset distribution initiated. check zone status
nexus-rz1-a# show zone status
VSAN: 10 default-zone: deny distribute: full Interop: 2
    mode: basic merge-control: allow
    session: none
    hard-zoning: enabled broadcast: disabled
Default zone:
    qos: none broadcast: disabled ronly: unsupported
Full Zoning Database :
    DB size: 6291 bytes
    Zonesets:1 Zones:62 Aliases: 44
Active Zoning Database :
    DB size: 10243 bytes
    Name: FABRIC1 Zonesets:1 Zones:60
Status: Zoneset distribution completed at 08:06:00 UTC Dec 3 2013
nexus-rz2-a# show zone status
VSAN: 1 default-zone: deny distribute: active only Interop: default
    mode: basic merge-control: allow
    session: none
    hard-zoning: enabled broadcast: disabled
Default zone:
    qos: none broadcast: disabled ronly: unsupported
Full Zoning Database :
    DB size: 4 bytes
    Zonesets:0 Zones:0 Aliases: 0
Active Zoning Database :
    Database Not Available
Status:
VSAN: 10 default-zone: deny distribute: full Interop: 2
    mode: basic merge-control: allow
    session: none
    hard-zoning: enabled broadcast: disabled
Default zone:
    qos: none broadcast: disabled ronly: unsupported
Full Zoning Database :
    DB size: 6291 bytes
    Zonesets:1 Zones:62 Aliases: 44
Active Zoning Database :
    DB size: 10243 bytes
    Name: FABRIC1 Zonesets:1 Zones:60
Status: Activation completed at 13:03:42 UTC Dec 2 2013

3750 switch and HP switch fiber connectivity issue

I have connected 2 Cisco 3750 switches "WS-C3750-48TS-S" with the LC to LC Duplex Single Mode fiber cable. Both the switches are communicating with each other.
As i have checked in the cisco document that GLC-SX-MM support only Multimode fiber cable. So i am surprised how does it support single mode fiber optic cable.
Can anyone tell me the reason for supporting single mode fiber optic cable?
But when i connect HP 4208 switch with the same Cisco 3750 the interface is showing up but the input packets are 0 and output packets are increasing on both ends.
I have checked the SFP's and fiber cable are compatible with HP.
Can anybody suggest me what can be the possible cause of this?
Regards,
Mukesh Kumar
Network Engineer
Spooster IT Services

I tried to troubleshoot this issue by using some show commands.
As i have checked that there are some specific commands to check SFP transreceiver as given below:
show hw-module subslot slot/subslottransceiver port idprom.
show interfaces {{[int_name] transceiver {[detail]} | {transceiver [module mod] | detail [module mod]}}
But these commands support only those transreceivers which support DOM. GLC-SX-MM doesn't support DOM.
Can anyone tell me that are there some troubleshoting commands to solve out the issue?
Regards,
Mukesh Kumar
Network Engineer
Spooster IT Services

Etherchannel between stack switches[3750] and standalone switch[3560]

Hi,
I have 2*3750 switches in stack as core and 1*3560 switch in access layer. I want to enable ether channel between stack switch[3750A & 3750B] and 3560 switches.
Have connected 2 links from 3560 switch to stack switch, one link to 3750A and other link to 3750B. Will it work in this way as per my requirement?
or i should enabled stacking on 3560 switch too and configure cross-stack ether channel between 3750 stack and 3560 stack. i refered few cisco documents, but the cross stack etherchannel configuration example has 3750 at both end stacks.
Rgds...
VikramS

Hi,
This should work fine as per you set up, the 3750 stack will be acting as one switch, which means that the ether-channel configuration should be straight forward. There is no need to stack the 3560 for this to work, also the 3560 are not stackable.
Hope this helps.

How does switching capacity of Nexus 7710 and Nexus 7718 calculate?

Hi everybody.
I found the nexus 7700 Fabric datasheet there was 220G per slot.
For example, the nexus 7710.
There was 220G per slot per fabric module and result is 6*220G*8=10560G, duplex is 21120G=21T.
How does the 42T came from?

Hi,
The 42 Tbps number Cisco are quoting is for the Nexus 7718 platform. If you look at the Cisco Nexus 7700 Switches Data Sheet you'll see it quotes:
The Cisco Nexus 7710 has six fabric module slots to provide simultaneously active fabric channels to each of the I/O and supervisor modules. Through the parallel forwarding fabric architecture, the Cisco Nexus 7710 can achieve 21 Tbps of forwarding capacity or more.
And for the Nexus 7718:
The Cisco Nexus 7700 18-Slot Switch has six fabric module slots to provide simultaneously active fabric channels to each of the I/O and supervisor modules. Through the parallel forwarding fabric architecture, the Cisco Nexus 7700 18-Slot Switch can achieve 42 Tbps of forwarding capacity or more.
So for the Nexus 7718 platform we have 220 Gbps * 6 Fabric Modules * 16 I/O slots totaling 21,120 Gbps. If we double that for full duplex we'll have 42,240 Gbps or 42 Tbps.
Regards

Help with multiple nat translation on a Cisco Nexus 3548

Hi All,
I need a little help with a NAT configuration on a cisco Nexus 3548 version 6.0(2)A4(3).
What currently have is as follows:
internal network: 192.168.4.0/24
nexus router (routerA):
LAN Side: vlan104 interface 192.168.4.201/24
WAN Side: Eth1/48 interface 172.24.101.2/24
remote network: 159.43.48.32/27
remote gateway: 172.24.101.1/24
use ACL's to ensure that only specific traffic is allowed out and in.
allow a specific connection from a different internal network (192.168.3.0/24) to talk to port 159.43.48.34:1025
Clients on the internal network 192.168.4.0, need to be able to connect to services (port 14002, port 8101) running on 159.43.48.34, but they must be SNAT'ed through the WAN interface as coming from 159.43.65.81
Currently we have this working but the internal lan clients need to know how to get to 159.43.48.34/27 and therefore we need to route this network in our internal network.
What we really want is to do is provide an address such as 192.168.4.203 for internal clients to use for connectivity to the various services, and then this address would be SNAT'ed to 159.43.65.81 over the WAN. We still want to secure the traffic in both directions.
In the past i've been able to do this with inside and outside nat's and i haven't had to configure an interface on the router for the internal address, it has just been "stood up" by the nat rules. For example (this is how i've done it before):
LAN interface
ip nat outside
WAN interface
ip nat inside
ip nat inside source static159.43.65.81 192.168.4.203
ip nat outside source static 159.43.65.81 192.168.4.203
but, trying to implement this sort of config on the Nexus isn't working.
I am wondering if the Nexus behaves differently than ios based routers.
I'd appreciate any help to get this config working.
Thanks in advance,
Les

Les
The issue with an "ip nat outside ..." static is that from the inside routing is done before NAT.
So what happens is that the destination IP is 192.168.4.203 and the Nexus will do a route lookup, see it is directly connected so it won't forward the packet to the outside interface so it doesn't get translated.
If you enter "ip nat outside source static 159.43.48.34 192.168.4.203" then on IOS it adds a host specific route to the routing table for 192.168.4.203 as directly connected.
So you do a ping from a 192.168.3.x client it looks like it is working but actually the L3 device is simply responding and the packet never gets to the server.
Apologies for the long winded explanation but NXOS might behave differently and I wanted you to know what to look for.
So with IOS there is the "add-route" option at the end of the NAT statement and if you use this it would add a host specific route into the routing table like this -
192.168.4.203 255.255.255.255 159.43.48.34
this is a recursive route ie. the device must know how to get to 159.43.48.34 but your Nexus should.
What the above does is make sure any packets arriving at the Nexus for 192.168.4.203 get routed to the outside interface and so are translated.
So firstly see if that option is available with your NAT statement ie.
"ip nat outside source static 159.43.48.34 192.168.4.203 add-route"
if it isn't then try adding just the static statement without it and then have a look at the routing table. If it hasn't put in a host specific route showing as directly connected which it may not, as it may behave differently, then you can manually add a route ie.
192.168.4.203 255.255.255.255 <next hop IP>
note that the next hop IP doesn't have to be the server here it could just be the next hop from the Nexus switch. All you are trying to do is get the packet routed to the outside interface.
Hope that makes sense.
Edit - one thing I haven't tried is to use a different IP subnet for NAT ie. one that is still part of your internal range but unused and then having a route on the Nexus, in your case, pointing to the outside interface and you redistribute this subnet into your IGP. Then you add the NAT statement.
What may happen is it still adds a host specific route showing as directly connected but it may not because the Nexus wouldn't actually have a directly connected interface for that subnet.
I suspect it would though.
If it did work then it would still mean you didn't need to advertise the public IP internally.
If I get the chance I'll test it later today.
Jon

Oracle RAC Interconnect, PowerVM VLANs, and the Limit of 20

Hello,
Our company has a requirement to build a multitude of Oracle RAC clusters on AIX using Power VM on 770s and 795 hardware.
We presently have 802.1q trunking configured on our Virtual I/O Servers, and have currently consumed 12 of 20 allowed VLANs for a virtual ethernet adapter. We have read the Oracle RAC FAQ on Oracle Metalink and it seems to otherwise discourage the use of sharing these interconnect VLANs between different clusters. This puts us in a scalability bind; IBM limits VLANs to 20 and Oracle says there is a one-to-one relationship between VLANs and subnets and RAC clusters. We must assume we have a fixed number of network interfaces available and that we absolutely have to leverage virtualized network hardware in order to build these environments. "add more network adapters to VIO" isn't an acceptable solution for us.
Does anyone know if Oracle can afford any flexibility which would allow us to host multiple Oracle RAC interconnects on the same 802.1q trunk VLAN? We will independently guarantee the bandwidth, latency, and redundancy requirements are met for proper Oracle RAC performance, however we don't want a design "flaw" to cause us supportability issues in the future.
We'd like it very much if we could have a bunch of two-node clusters all sharing the same private interconnect. For example:
Cluster 1, node 1: 192.168.16.2 / 255.255.255.0 / VLAN 16
Cluster 1, node 2: 192.168.16.3 / 255.255.255.0 / VLAN 16
Cluster 2, node 1: 192.168.16.4 / 255.255.255.0 / VLAN 16
Cluster 2, node 2: 192.168.16.5 / 255.255.255.0 / VLAN 16
Cluster 3, node 1: 192.168.16.6 / 255.255.255.0 / VLAN 16
Cluster 3, node 2: 192.168.16.7 / 255.255.255.0 / VLAN 16
Cluster 4, node 1: 192.168.16.8 / 255.255.255.0 / VLAN 16
Cluster 4, node 2: 192.168.16.9 / 255.255.255.0 / VLAN 16
etc.
Whereas the concern is that Oracle Corp will only support us if we do this:
Cluster 1, node 1: 192.168.16.2 / 255.255.255.0 / VLAN 16
Cluster 1, node 2: 192.168.16.3 / 255.255.255.0 / VLAN 16
Cluster 2, node 1: 192.168.17.2 / 255.255.255.0 / VLAN 17
Cluster 2, node 2: 192.168.17.3 / 255.255.255.0 / VLAN 17
Cluster 3, node 1: 192.168.18.2 / 255.255.255.0 / VLAN 18
Cluster 3, node 2: 192.168.18.3 / 255.255.255.0 / VLAN 18
Cluster 4, node 1: 192.168.19.2 / 255.255.255.0 / VLAN 19
Cluster 4, node 2: 192.168.19.3 / 255.255.255.0 / VLAN 19
Which eats one VLAN per RAC cluster.

Thank you for your answer!!
I think I roughly understand the argument behind a 2-node RAC and a 3-node or greater RAC. We, unfortunately, were provided with two physical pieces of hardware to virtualize to support production (and two more to support non-production) and as a result we really have no place to host a third RAC node without placing it within the same "failure domain" (I hate that term) as one of the other nodes.
My role is primarily as a system engineer, and, generally speaking, our main goals are eliminating single points of failure. We may be misusing 2-node RACs to eliminate single points of failure since it seems to violate the real intentions behind RAC, which is used more appropriately to scale wide to many nodes. Unfortunately, we've scaled out to only two nodes, and opted to scale these two nodes up, making them huge with many CPUs and lots of memory.
Other options, notably the active-passive failover cluster we have in HACMP or PowerHA on the AIX / IBM Power platform is unattractive as the standby node drives no resources yet must consume CPU and memory resources so that it is prepared for a failover of the primary node. We use HACMP / PowerHA with Oracle and it works nice, however Oracle RAC, even in a two-node configuration, drives load on both nodes unlike with an active-passive clustering technology.
All that aside, I am posing the question to both IBM, our Oracle DBAs (whom will ask Oracle Support). Typically the answers we get vary widely depending on the experience and skill level of the support personnel we get on both the Oracle and IBM sides... so on a suggestion from a colleague (Hi Kevin!) I posted here. I'm concerned that the answer from Oracle Support will unthinkingly be "you can't do that, my script says to tell you the absolute most rigid interpretation of the support document" while all the time the same document talks of the use of NFS and/or iSCSI storage eye roll
We have a massive deployment of Oracle EBS and honestly the interconnect doesn't even touch 100mbit speeds even though the configuration has been checked multiple times by Oracle and IBM and with the knowledge that Oracle EBS is supposed to heavily leverage RAC. I haven't met a single person who doesn't look at our environment and suggest jumbo frames. It's a joke at this point... comments like "OMG YOU DON'T HAVE JUMBO FRAMES" and/or "OMG YOU'RE NOT USING INFINIBAND WHATTA NOOB" are commonplace when new DBAs are hired. I maintain that the utilization numbers don't support this.
I can tell you that we have 8Gb fiber channel storage and 10Gb network connectivity. I would probably assume that there were a bottleneck in the storage infrastructure first. But alas, I digress.
Mainly I'm looking for a real-world answer to this question. Aside from violating every last recommendation and making oracle support folk gently weep at the suggestion, are there any issues with sharing interconnects between RAC environments that will prevent it's functionality and/or reduce it's stability?
We have rapid spanning tree configured, as far as I know, and our network folks have tuned the timers razor thin. We have Nexus 5k and Nexus 7k network infrastructure. The typical issues you'd fine with standard spanning tree really don't affect us because our network people are just that damn good.

ESXi 4.1 NIC Teaming's Load-Balancing Algorithm,Nexus 7000 and UCS

Hi, Cisco Gurus:
Please help me in answering the following questions (UCSM 1.4(xx), 2 UCS 6140XP, 2 Nexus 7000, M81KR in B200-M2, No Nexus 1000V, using VMware Distributed Switch:
Q1. For me to configure vPC on a pair of Nexus 7000, do I have to connect Ethernet Uplink from each Cisco Fabric Interconnect to the 2 Nexus 7000 in a bow-tie fashion? If I connect, say 2 10G ports from Fabric Interconnect 1 to 1 Nexus 7000 and similar connection from FInterconnect 2 to the other Nexus 7000, in this case can I still configure vPC or is it a validated design? If it is, what is the pro and con versus having 2 connections from each FInterconnect to 2 separate Nexus 7000?
Q2. If vPC is to be configured in Nexus 7000, is it COMPULSORY to configure Port Channel for the 2 Fabric Interconnects using UCSM? I believe it is not. But what is the pro and con of HAVING NO Port Channel within UCS versus HAVING Port Channel when vPC is concerned?
Q3. if vPC is to be configured in Nexus 7000, I understand there is a limitation on confining to ONLY 1 vSphere NIC Teaming's Load-Balancing Algorithm i.e. Route Based on IP Hash. Is it correct?
Again, what is the pro and con here with regard to application behaviours when Layer 2 or 3 is concerned? Or what is the BEST PRACTICES?
I would really appreciate if someone can help me clear these lingering doubts of mine.
God Bless.
SiM

Sim,
Here are my thoughts without a 1000v in place,
Q1. For me to configure vPC on a pair of Nexus 7000, do I have to connect Ethernet Uplink from each Cisco Fabric Interconnect to the 2 Nexus 7000 in a bow-tie fashion? If I connect, say 2 10G ports from Fabric Interconnect 1 to 1 Nexus 7000 and similar connection from FInterconnect 2 to the other Nexus 7000, in this case can I still configure vPC or is it a validated design? If it is, what is the pro and con versus having 2 connections from each FInterconnect to 2 separate Nexus 7000? //Yes, for vPC to UCS the best practice is to bowtie uplink to (2) 7K or 5Ks.
Q2. If vPC is to be configured in Nexus 7000, is it COMPULSORY to configure Port Channel for the 2 Fabric Interconnects using UCSM? I believe it is not. But what is the pro and con of HAVING NO Port Channel within UCS versus HAVING Port Channel when vPC is concerned? //The port channel will be configured on both the UCSM and the 7K. The pro of a port channel would be both bandwidth and redundancy. vPC would be prefered.
Q3. if vPC is to be configured in Nexus 7000, I understand there is a limitation on confining to ONLY 1 vSphere NIC Teaming's Load-Balancing Algorithm i.e. Route Based on IP Hash. Is it correct? //Without the 1000v, I always tend to leave to dvSwitch load balence behavior at the default of "route by portID".
Again, what is the pro and con here with regard to application behaviours when Layer 2 or 3 is concerned? Or what is the BEST PRACTICES? UCS can perform L2 but Northbound should be performing L3.
Cheers,
David Jarzynka

QoS Questions for 3750 Switches

2x3750 switches are stacked and we are trying to simulate traffic congestion at the UTP ports by using Smartbit 6000C. The objective of the test is to see if the QoS setting works in reality even though we see from Wireshark that the packets are marked with DSCP for voice traffic.
Setup is as follows :
Smartbit<->Avaya IP Phone<->3750 switches<->6509 switch.
Please note that the configuration is set on the 3750 switch port as well as trusted on the Cat 6 switch port. However, when I set to continuous traffic with byte size of 64. Even though its a 100Mbps port, the Avaya IP Phone is already acting weird with hanged symptom. Just side note is that performing "show mls qos inter gi2/0/7 statistic" shows that data and voice traffic are marked on the different priority which seemed correct.
1) Is this the right way to test? If not, what should be the correct way?
2) The port that's connected to Smartbit is configured and it seemed that with the continuous traffic, even other IP Phones are hanged even though I have set Smartbit to hit on the IP address of the CAT6 Switch port. This is not normal right as this is supposed to be unicast traffic. Any idea what could be the reason?

Hello Brandon,
I understand your concern and how you want to test, but with the VoIP services you need to understand that there are 2 points (telephones if you want) involved. Your local one, where you might have taken all the necessary steps to protect and prioritize your voice traffic, and the oposite end which also need to have the voice packets prioritized.
Now, from your description, I understand that the packets (voice and data) marked correctly (I believe on C3750), but that's not enough. You need to use CBWFQ together with LLQ to give priority to the Voice traffic over data in case of congestion. Do you have such configuration? Can you show us some excerpt from it?
Next, during the testing, you said that your phone hang-up...where you in a call?
To respond to your questions:
1. The start is ok, but we need more details. You are pushing traffic from Smarbit, this is your local end, but where is the traffic pushed to (remote end), who is receiving the traffic?
2. In theory, you shouldn't have any impact over voice if links are 100Mbit, only if you have such a power packet generator that could fill 100Mbit. What do you mean by "This is not normal right as this is supposed to be unicast traffic"? VoIP is also unicast traffic...
I can see that you are determined to solve this issue, and this is OK as it will help you back with gained knowledge, but I have to warn you that troubleshooting QoS / Voice related problems may be more tricky than you think, as it will involve a strong know-how in these areas.
We will help, but you have to come back with more precise details.
Good luck!
Calin

NEXUS 3548 with 24 Port License

Ive a 3548 box with 24port Lic,My concern is about the functionality of the remaining 24 Ports.Will there be a problem with the rest of the 24 ports while in production.
NX3548# sh inventory
NAME: "Chassis", DESCR: "Nexus 3548 Chassis"
PID: N3K-C3548P-10G    , VID: V02 , SN: XXXXXXXXXX
NAME: "Module 1", DESCR: "48x10GE Supervisor"
PID: N3K-C3548P-10G    , VID: V02 , SN: XXXXXXXXXX
NX3548# SH LICense usage
Feature                      Ins Lic   Status Expiry Date Comments
                                 Count
24P_LIC_PKG                   Yes   -   Unused Never       -
24P_UPG_PKG                   No    -   Unused             -
LAN_BASE_SERVICES_PKG         Yes   -   Unused Never       -
ALGO_BOOST_SERVICES_PKG       No    -   Unused             -
LAN1K9_ENT_SERVICES_PKG       No    -   Unused             -
LAN_ENTERPRISE_SERVICES_PKG   No    -   Unused             -

Hello Dhanesh,
thanks for your reply.
We have 2 3548 licensed exactly as your Nexus.
After a reboot of the two Nexus the first 4 ports (of the two) had problems (no input packets, only ouput packets, so unusable). There was connected devices with GLC-T, so they worked at 1 G, not 10G.
We opened a TAC Case about this and, after remote session and many analysis, the engineer decided to replace the two devices.
Despite this I have still some doubt.
I found the discussion below and I post some logs of one of the Nexus, we use the 10 G not in a contiguous way.
Thanks and regards
https://supportforums.cisco.com/discussion/12073821/nexus-3548-24-port-license-what-ports-use
371) Event:E_DEBUG, length:55, at 552701 usecs after Sat Mar 14 20:02:11 2015
    [825307441] Couldn't send grace period data: No route to host
372) Event:E_DEBUG, length:58, at 255834 usecs after Sat Mar 14 19:02:57 2015
    [825307441] Couldn't fetch grace enabled status: no such pss key
373) Event:E_DEBUG, length:55, at 819209 usecs after Sat Mar 14 19:02:18 2015
    [825307441] Couldn't send grace period data: No route to host
374) Event:E_DEBUG, length:44, at 818664 usecs after Sat Mar 14 19:02:18 2015
    [825307441] Failed to get VDC map: no such pss key
375) Event:E_DEBUG, length:44, at 818270 usecs after Sat Mar 14 19:02:18 2015
    [825307441] Transient read error in glob_refresh()
376) Event:E_DEBUG, length:60, at 813122 usecs after Sat Mar 14 19:02:18 2015
    [825307441] Expiry date for feature LAN_BASE_SERVICES_PKG: 3650000
377) Event:E_DEBUG, length:50, at 773120 usecs after Sat Mar 14 19:02:18 2015
    [825307441] Expiry date for feature 24P_LIC_PKG: 3650000
378) Event:E_DEBUG, length:30, at 716563 usecs after Sat Mar 14 19:02:08 2015
    [825307441] checking confcheck config
N3K-DC-1# sh int status
Port          Name               Status    Vlan      Duplex Speed   Type
Eth1/1        *** FREE ***       sfpAbsent 1         full    1000    --
Eth1/2        *** FREE ***       sfpAbsent 1         full    1000    --
Eth1/3        *** FREE ***       sfpAbsent 1         full    1000    --
Eth1/4        *** FREE ***       sfpAbsent 1         full    1000    --
Eth1/5        UCS_UPLINK_FABRIC_ connected trunk     full    10G     SFP-H10GB-CU5M
Eth1/6        UCS_UPLINK_FABRIC_ connected trunk     full    10G     SFP-H10GB-CU5M
Eth1/7        --                 sfpAbsent 1         full    10G     --
Eth1/8        --                 sfpAbsent 1         full    10G     --
Eth1/9        --                 sfpAbsent 1         full    10G     --
Eth1/10       --                 sfpAbsent 1         full    10G     --
Eth1/11       --                 connected trunk     full    1000    1000base-T
Eth1/12       --                 connected trunk     full    1000    1000base-T
Eth1/13       --                 sfpAbsent 1         full    10G     --
Eth1/14       --                 sfpAbsent 1         full    10G     --
Eth1/15       --                 sfpAbsent 1         full    10G     --
Eth1/16       --                 sfpAbsent 1         full    10G     --
Eth1/17       --                 sfpAbsent 1         full    10G     --
Eth1/18       --                 sfpAbsent 1         full    10G     --
Eth1/19       --                 sfpAbsent 1         full    10G     --
Eth1/20       --                 sfpAbsent 1         full    10G     --
Eth1/21       --                 sfpAbsent 1         full    10G     --
Eth1/22       --                 sfpAbsent 1         full    10G     --
Eth1/23       --                 sfpAbsent 1         full    10G     --
Eth1/24       --                 sfpAbsent 1         full    10G     --
Eth1/25       --                 sfpAbsent 1         full    10G     --
Eth1/26       --                 sfpAbsent 1         full    10G     --
Eth1/27       --                 sfpAbsent 1         full    10G     --
Eth1/28       --                 sfpAbsent 1         full    10G     --
Eth1/29       --                 sfpAbsent 1         full    10G     --
Eth1/30       --                 sfpAbsent 1         full    10G     --
Eth1/31       *** FREE ***       notconnec 1         full    1000    1000base-T
Eth1/32       --                 sfpInvali 1         full    10G     1000base-T
Eth1/33       --                 sfpAbsent 1         full    10G     --
Eth1/34       --                 sfpAbsent 1         full    10G     --
Eth1/35       --                 sfpAbsent 1         full    10G     --
Eth1/36       --                 sfpAbsent 1         full    10G     --
Eth1/37       --                 sfpAbsent 1         full    10G     --
Eth1/38       --                 sfpAbsent 1         full    10G     --
Eth1/39       --                 sfpAbsent 1         full    10G     --
Eth1/40       --                 sfpAbsent 1         full    10G     --
Eth1/41       --                 sfpAbsent 1         full    10G     --
Eth1/42       --                 sfpAbsent 1         full    10G     --
Eth1/43       --                 notconnec 1         full    10G     10Gbase-SR
Eth1/44       --                 notconnec 1         full    10G     10Gbase-SR
Eth1/45       C3850-CORE [Port-C connected trunk     full    10G     10Gbase-SR
Eth1/46       C3850-CORE [Port-C connected trunk     full    10G     10Gbase-SR
Eth1/47       vPC PeerLink [Port connected trunk     full    10G     SFP-H10GB-CU3M
Eth1/48       vPC PeerLink [Port connected trunk     full    10G     SFP-H10GB-CU3M
Po2           C3850-CORE         connected trunk     full    10G     --
Po3           3750-DC            connected trunk     full    a-1000 --
Po4           UCS_UPLINK_FABRIC_ connected trunk     full    10G     --
Po10          vPC PeerLink       connected trunk     full    10G     --
mgmt0         --                 connected routed    full    a-1000 --

3750 switch stacks

I am new to the networking world and have some questions.
I have 1 stack of six 3750 switches with a 10.50.3.10 ip address
On the first stack (.10)I have int 6/0/19 , 20 and 21 assigned.
I have a second ip scheme with one switch with an ip of 10.50.3.11
Do I use a smartwise cable to connect the switches even though they have different ip schemes? Or do I use a only a cat 5 to connect the 2 differenet stacks. Also, do I need to configure the 6/0/19, 20 and 21 ports on the second ip scheme. I don't think it is possible now that I am writing this if the smartwise cables are not used. Any help would be appreciated.

I apologize but I am not following you entirely. If you stack the 3750, you must use the stacking port and use the stackwise cable.
You said: I have 1 stack of six 3750 switches with a 10.50.3.10 ip address
>> This would mean you stacked them using the stackwise cable and all these six switches are seen as one single device.
What do you mean by you have int 6/0/19-21 assigned? Assigned them what?
You said: I have a second ip scheme with one switch with an ip of 10.50.3.11
>> Sounds like you have another stack? Because the device will complaint if you address two different interfaces in teh same switch/router to the same subnet (10.50.3.10 and 10.50.3.11), unless these addresses are masked as host but I doubt that.

Thoughs on interconnecting Nexus 3548 and 3750 switches

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