Cisco Switching/Routing :: Nexus 3064 Uni-cast Flooding
Jun 9, 2013
I have a Nexus 3064 which is not recording source MAC addresses after a successful ARP. The switch is then flooding the entire vlan with unicast traffic.
The config is a boring single VLAN. One port (48) is going to a 6509. Not as a trunk, just extending the VLAN. There are SVI's on both switches. the default route for the Nexus users is the 6509's IP.The switch was basically, pulled out of the box, setup a single vlan(with jumbo frames) andan SVI, then plugged in the users. Nothing special.
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Jun 18, 2012
I want to bring up 40G interface between two nexus 3064 over the fiber but it's not coming up. Have configured the switch for 48*10G and 4*40G. I'm using QSFP on both the switches, OM3 straight fiber cable with MPO connector. The interfaces are not coming up. Notably, it comes up with Coax 3M cable. So it's fine with coax but not with fiber.
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May 23, 2012
I have a Cisco Nexus 3064 that I am using as part of a flat network for the Lab. I have 30 Virtualization Servers(MS HyperV and VMware vSphere) connected to this switch and I want to enable jumbo frames. The Virtualization Servers are able to ping the local VM's using 8K bytes. However I am unable to ping from server to server using 8K bytes. I have configuration (in abbreviation). All the servers are in the same network which I configured as L2 ports with the "switchport" command. However, the interface "MTU" command is unavailable in L2 mode. I am only able to get the interface "MTU" command only in L3 mode with the "no switchport" command on the interface.
# int eth1/2-45
# no switchport
# mtu 9216
# no shut
I can ping the servers with less than 1500 bytes, but anything larger fails.
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Nov 15, 2011
Does one can use a Vacl to monitor network traffic on a nexus 3064 much like you can on the 6500s? If so, any performance tradeoffs or caveats to be aware of ?
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Mar 3, 2013
I have a lot microbursts in my network and i looking 10G switches with big buffers. Which models have biggest buffers ? I think about 1-2U (nax 4U) switch with up to 60-100 10G ports. Something like nexus 3064 (he has only 9MB shared buffers AFAIK). Besides deep buffers i need also:
- trill or another ethernet ring topology like erps,eapsv2,
- Multi chassis LAG,
- virtual routers, policy routing
- dcb
- 40G interfaces will be plus
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Nov 28, 2011
I have a serious problem with nexus 7018, there're unicast flooding on one n7k, named n7k-1, which is the member of vPC domain combined with 2 N7Ks. [code]I had clean the mac-address-table, and all mac-address-tables had been synced fine, and the unicast flooding went away.
How could I fix the mac-address sync function between the modules ?
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May 29, 2013
I want to monitor our backup server (commvault) as it is saying it's library (Data Domain) is going off line.[code] The issue is I am seeing a lot of unicast traffic (on Wireshark) that has nothing to do with the server on E2/11. Some of it is from different VLANs... There is way too much data (multi-Mbps) to keep wireshark running very long to capture our intermitten problem.
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May 8, 2013
We have a NEXUS 7000 running PIM SM. A checkpoint firewall is networke to it configured for PIM Dense mode. The RP is configured on the NEXUS Siwtch that the firewall is connected to.The firewall statically forwards multicast to the NEXUS.
I need the NEXUS to register the Multi cast so it can be routed to other networks.I've been able to get it working with 3750's but no answer.
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Oct 28, 2012
I have a network with several catalyst 2960 switches and one catalyst 3750. I have created two VLAN and set up the proper routing and everything is working fine there. I have a client/server application that used multicast in the initial start up for the client to determine available servers, the issue is one of my clients is on a different VLAN then the server. I am able to route the multicast using MVR as long as both the server and the client are plugged into the 3750 by creating a static route, making the server a source port and the client a receive port. Unfortunately I need the client and the server plugged in to different 2960s. My question is how do I establish multicast routing between the two and perferably do it dynamically (always route multicast traffic from one VLAN to another).
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Jan 9, 2011
I'm having an issue with my network, where we're are experiencing random and brief network outages. They happen a couple times a day and last 5-10 seconds. when I check my two backbone switches (4506 : Supervisor: WS-X4516-10GE ,IOS : cat4500-ipbase-mz.122-31.SGA8.bin), STP remains normal and no topology change occurs.
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Nov 3, 2011
I have a 2x Cisco 3750G switches (Stacked) that are part of an IP Video Surveillance System .All network is set to 1 VLAN (VLAN 1 default).The Cisco SWs ( Core ) are configured with IGMP Querier + Snooping .Connected to the Cisco SWs are 4 Fiber Rings(Loops) for redundancy . RSTP and IGMP Snooping are enabled on all the network SWs .Network Architecture Figure :
When all Fiber Rings (Loops ) are connected , the Cisco and Ring SWs spanning-tree tables show the blocked and forwarding ports properly .I am able to connect all my IP Cams + Encoders to the Ring SWs and connect my Servers + WorkStations to the Cisco SWs to record and view the multicast ip streams .All streams from Rings 1 ,3 and 4 are getting normally to the Servers + WorkStations through multicast ( IGMP Snooping are filled correctly on the Cisco and non-Cisco SWs ) . All multicast streams are joined normally except for Ring 2 .The Multicast streams passing through Ring 2 will operate normally for around 2 hours then after that the Fiber SWs begin to flood their multicast traffic causing the cams on the same switch to drop off the network .
I checked the Configuration of all the SWs on Ring 2 but all are are the same .
What is weird is that I have to set all the streams to unicast to stop the flooding just on Ring 2 (All other rings are not affected ) then after some time if I enabled a video multicast stream on one of the SWs of the Ring it will be streamed properly to the Servers + WorkStations ( All IGMP tables along the way will be filled properly ) then again after 2 hours or so , the flooding will start again suddenly and all IGMP table entries for the SW on Ring2 will be empty . No problem occurs on the other Rings which have more multicast streams .
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Feb 23, 2011
We are facing issue of continous packet discards On nexus4001L link (int po2) to Nexus5020 switch. Nexus4001L is installed in IBM blade center server and we have FCOE enabled in this setup. [code]
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Mar 15, 2013
I have been tasked to replace the existing Cat 6500 and 3750 switches by Nexus 7000 and Nexus 2000.I was told initially my boss plans to get 2 x Nexus 7000 and then eventually blow up to 4 x Nexus 7000s.For Nexus, is there a list of tasks / points that i need to consider for building the initial design?
Can i just link the Nexus 7000 like the following?
N7k-A ========= N7k-B
| |
lots of N2ks lots of N2ks
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Dec 22, 2011
Struggle to find the SNMP MIBS of the Nexus 5000 FEX tranceivers.
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Nov 13, 2012
we are planning a Nexus datacenter project with this layout:Our experiences with Nexus switches are not so large until now and the manuals are very extensive.Both N5K´s should be connected directly with all 4 N2K switches. I did not find a layout like this in the manuals. Only a design,where only 2 N2K are connected to one N5K, with this fex config:Now I´m not sure if it is right to make a config like this with the same slots and fex´s or with different slots and fex´s.
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Apr 9, 2010
Does the nexus 7010 support virtual switching yet? All of the posts I have found from about a year ago say that it is going to be supported, but there were no dates listed. I heard the same thing from Cisco a while back, but haven't followed up with it.If it is supported finally are there any configuration guides available for it?
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Oct 8, 2012
Lucien is a customer support engineer at the Cisco Technical Assistance Center. He currently works in the data center switching team supporting customers on the Cisco Nexus 5000 and 2000. He was previously a technical leader within the network management team. Lucien holds a bachelor's degree in general engineering and a master's degree in computer science from Ecole des Mines d'Ales. He also holds the following certifications: CCIE #19945 in Routing and Switching, CCDP, DCNIS, and VCP #66183
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Jan 10, 2012
Can nexus 5010 supports inter v lan routing , as there is no core switch and router available in current network.
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May 16, 2013
We have our Nexus as our default gateway (101.1) and the default VLAN1 is setup with two subnets 101.X and 102.X. The DHCP server is using a superscope setup to accomodate the overflow of devices requesting IPs on 101, so when 101 is consumed persons are able to obtain a 102.X IP address. The setup is basic on superscope. The issue is some times the routing to the firewall with a 102.X is not always 100%. Somedays all goes well and the 102 subnet is routed out to the firewall and its a good day. However, such as today a 102.X address is not routing as it did 24 hours ago. I am perplexed as to why this is behaving unpredicatable. Here is running-config for VLAN1 to show the 102 as secondary address to VLAN1.
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Feb 16, 2011
you find attached my network architecture with 2 Nexus 7010 on core layer and 2 Nexus 5020 on distribution layer, each one with 1 N2148T fabric extender switch. PC-A1 and PC-A2 are connected to one N2148T, PC-B1 is connected to the other N2148T. Nexus-7000-1 is HSRP Active for all VLANs, Nexus-7000-2 is HSRP standby. PC-A1 and PC-A2 are connected to VLAN A, PC-B1 is connected to VLAN B. PC-A1 and PC-A2 have the same default gateway correspondent to IP HSRP on VLAN A. It happens that PC-A1 is able to ping PC-B1 while PC-A2 is unable to ping PC-B1. If I issue a traceroute from PC-A2 I see Nexus-7000-2’s physical IP address as the first hop even if Nexus-7000-2 is HSRP standby. After the first hop the traceroute is lost. If I shutdown Port-channel 20 on Nexus-5000-2, PC-A2 starts to ping PC-B1.I can’t understand what’s wrong in this architecture.
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Mar 25, 2012
I have an environment where i have two nexus 7010 switches, along with 2 nexus 5510's. I need to run OSPF as a layer 3 routing protocol between the vpc peer links. I have 1 link being used as a keep alive link, and 3 other links being used as a VpC link.
1) Is it best to configure a separate Vpc VLAN i.e 1010
2) Is it best to configure a vrf context keep-alive
3) just have the management address as the peer ip's.
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Feb 6, 2012
I have a pair of 5548P switches with the L3 daughter cards installed. Using the base license as I just need RIP routing. I have the two switches setup and have the RIP routing feature enabled. When I "turn on" routing using RIP I do not get any routes from my existing L3 switch (3750). I probably don't have routing setup correctly. With the 3750 IOS, I just turned on RIP with the router rip command and added a couple of network statements. On the nexus I have run router rip {instance} and left it at that. I am not getting any routes from my 3750. The 5548s are using the management ports and are connected to my existing network with L2 trunks. Does any know of a setup guide for RIP? I have used the Nexus 7000 RIP guide but still can't get it to work.
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Dec 15, 2010
We have network consisting of approx. 8 7200's running LNS/MPLS/BGP and we provide predominantly private networks to clients(Majority of client networks are a mix of Ethernet tails and DSL).We have received a request from one client to support multicast - Having never implemented multicast, have a few questions:
1. Is is supported/possible to provide multicast within a vrf on 7200's?(From initial investigations, it appears to be)
2. Is it possible to only enable mutilcast in a vrf(i.e. not globally)?
3. Any recommended guides/best pratices?(Googling has revealed nothing really that is similiar to what we want to do)4. What are the potential ramifications?(Resource overhead, Security implications, anything else?)
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Mar 26, 2010
Recently upgraded to 1.33NA. I keep getting this message when changing certain settings (such as enabling a guest zone). It's essentially locking me out of changing the system!As far as I know - the DIR-655 DOESN'T have WDS - this was removed a number of firmware revisions ago. I cannot find a setting for this anywhere. There are a few mentions of this on this forum and the web, but nothing concrete as to why it's happening or a valid solution.[url]...
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Jul 2, 2012
I''ve trying to bring up ports on a N7K-M108X2-12L card using X2-10GB-SR modules.
All ports are in a VDC and configured to accept the M1 card:
vdc_id vdc_name state mac type lc
------ -------- ----- ---------- --------- ------
2 cam-cor-csw-sfy-01 active 64:a0:e7:43:f0:c2 Ethernet m1 f1 m1xl
[Code]....
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Feb 18, 2013
This is regarding Nexus core switch 7010. We are already running two nexus 7K with ten Nexus 5k. Currently we are going to add two new Nexus 5k in our DC. In the 7K we already running two VDC's.
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Jun 8, 2013
The fans 1 & 2 in Module 1 on the Nexus5K are still experiencing the very high RPM and speed issue.
I have replaced the fan from another operational Nexus5K, and the fans are fine in the other Nexus. The replacement fans also have the same issues, so it is not a fan hardware issue.
There are no threshold alarms. the only log entry that is related to this is as follows:
%NOHMS-2-NOHMS_ENV_ERR_FAN_SPEED: System minor alarm in fan tray 1: fan speed is out of range on fan 1. 7950 to 12500 rpm expected. I have provided the output for both the fan detail and the temperature.
N5K-01# sh environment fan detail
Fan: --------------------------------------------------- Module Fan Airflow Speed(%) Speed(RPM) Direction --------------------------------------------------- 1 1
[Code].....
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Feb 22, 2012
I was reading a QoS walkthrough earlier to try to solve my problem and I noticed that in IOS, you can specify "match vlan" in a class map. This is not available in NX-OS. I'm not doing any routing on the 5K so I cannot match on ACL, and port where traffic is received is a trunk sharing other types of traffic I'd like to classify elsewise.
How can I match traffic on a per-VLAN basis?
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Oct 26, 2011
How to configure a nexus 5K?
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Mar 14, 2013
Just upgraded Nexus 7k from 5.2.1 to 5.2.7 (just system and kickstart image and NOT epld image). but after upgrading the one of the fex(n2k) dont seem to come online (this nexus 7k has two n2k and one of them came online and working fine)
[code]....
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Aug 14, 2012
I have a couple of Nexus 5ks that I want to put QOS on for the servers running behind it but also have voice running across it. Voice doesn't play well with jumbo frames so I'd like to put QOS only on the voice vlan.
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Apr 17, 2013
I am working in my lab and I was adding a new L2/3 vlan
vlan 555
name test
int vlan 555
ip address 1.1.1.1/24
no shut
I have also ensured that this vlan is added to the port channel going to my Nexus5K's. I added the vlan to the 5K's and also ensured that vlan 555 is traversing the peer link. all is good there. I have also placed a device on a interface on the 2k as a access switchport on vlan 555
Here is my problem, the L3 interface will NOT come up on the 7K
LAB-DSW01# sh ip int brie
IP Interface Status for VRF "default"(1)
Interface IP Address Interface Status
Vlan555 1.1.1.1 protocol-down/link-down/admin-up
I have gone throug just about everything I can think of and I am still unable to get this L3 interface to come up. I have other L3 interfaces on this device that are configured exactly the sameway without any issue at all. All the existing interfaces are working properly, it's jut this new interface that I am trying to add.
I am running version 6.0.1 on the 7K and 5.2.1.N1.4 on the 5K.
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Feb 24, 2013
Its required that all ports on nexus 7k should be user configurable as either 1G/10G/FcoE. Which module do i need in this case ?
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