Cisco Switching/Routing :: Nexus 5k To 2k To 10gig Server Connectivity?
Nov 11, 2012
We are in the plan of implementing a new 10gig network. For this we have chosen the Nexus 5596 and 2232 pair. What are the transceivers/accesories I should order for connecting 10Gig servers of NC552SFP dual port NICs to the 2232 in High availability (NIC 1 to 2232PP 1 and NIC 2 to 2232PP 2). Should I order the FEX SFP+ uplink conector to conect 5k and 2232 also (or its aded to the Nexus box itself) ? Also, is it fine to have Nexus 2232 in floor 2 and Parent neus in Floor 3 (say seperatd by a max of 400meters)?
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Nov 13, 2011
I'm unable to get the N7K-M108X2-12L 10 Gbps Ethernet XL Module within our Nexus 7009 chassis to recognise the individual X2-10GB-SR transceiver modules. I have the same issue on another 7009 chassis.If I perform a 'show interface'. I get the following output saying SFP not inserted.
-Ethernet3/5 is down (SFP not inserted)
-Dedicated Interface
-Belongs to Po51
-Hardware: 10000 Ethernet, address: 7081.0599.d458 (bia 7081.0599.d458)
I also get the same result if I issue the following command. Are their any additional features I need to enable? or would this be a license issue?
Have already tried different X2-10GB-SR modules, reloading the card, re seating the card. [code]
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Nov 12, 2012
We have two 5548 switches connected to a pair of 6509 running in VSS mode. I am trying to understand the benefit of having bridge assurance on the uplink ports.
If we have the command spanning-tree port type network enabled we cannot do a non disruptive upgrade. If there is bridge assurance on the uplink it warns you of this. Yet if I do not run bridge assurance on the uplinks I can do a upgrade without any disruption.
Why in god would I enable bridge assurance on this VPC link if I cannot do a non disruptive upgrade?
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Mar 30, 2013
Configuration details: I have 2 nexus 5K switches and both 5K is connected to four 2960 access switches in each floor through fiber(shown in the attached picture). I have configured each VPC for each floor and portchannel configuration on 2960s switch to communicate to 5K switches. Now I am not able to communicate PC 1 connected in 1st floor to PC2 connected in 4th Floor.
I have attached topology map of my infra and the configuration files also. 1st floor switch and 4th floor swich have same configuration except IP address and switch name.
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Jan 2, 2013
We recently had a pair of Nexus 5k switches setup in our network. We had professional services handle the initial configuration but they weren't able to setup config sync for us. Each Fex is connected to each 5k, so we need a switch-profile to maintain a consistent setup on our interfaces. I went through the process in Configuring Switch-Profiles, but when I check the status of the peer, it says not reachable. [code]
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Aug 15, 2012
In the existing network we have Cisco 2811 router connected to Corporate MPLS cloud. Cisco 2811 is connected to Catalyst 6509 switch(set based IOS with MSFC card). Along with that we have two Catalyst 5509. We are upgrading the access layer by replacing catalyst switches with Nexus 5548 & 2248.
For a purpose of testing I have connected 5548 & 2248. Created cPC and ether channels between two. SVI and HSRP configuredon 5548. I am terminating 2651 (test router) on 2248 port 101/1/1. On 5548 I have enabled EIGRP on vlans. I am unable to ping to 2651 from nexus switch 5548 and vice-versa. I can see both devices on CDP but I do not see eigrp neighborship formed.
What configuration should go in 2248 and 2651 in order to establish a connection between two? If test is successful then I will connect 2811 to 2248 during actual migration. I assume that in testing if it works for 2651 then it must work on 2811 router.
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Apr 26, 2013
We have deployed a few ASA 5585 SSP40 in our data centers to seperate different customer/security zones connected with 10Gig interfaces. Currently we have a dedicated log server attached to each ASA connected with a p2p 10Gig interface. While detailed log information is considered important I somehow have the gut feeling all this high end equipment and bandwidth is used a little too wasteful. I have little experience with these big firewalls and I have not yet seen the equipment in an attack situation, however I doubt a firewall could ever generate 10gig of log data, while doing the primary fire walling job at the same time. Looking at the typical packet size of a syslog message I don't even believe a 1 gig link could ever be saturated with pure syslog messages.
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Nov 14, 2011
it's possible to let the Nexus 5548UP act as a DHCP server? (or if it will be possible in future releases)
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Apr 1, 2012
We are planning to have attach topology with nexus 5548 using vpc. Let me know if this i possible. I want to configure dual NIC linux server using LACP active mode to connect to two 5548 in VPC for redudancy as well as use of full access layer bandwidth. On nexus this will be access port in single port channel in single VPC link.
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Oct 26, 2011
Can I configure a DHCP Servero on the Nexus 7018?
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Jul 15, 2012
My Name is senthil i need to configure new hp sever with Nexus 5548 how to config.. server side everything finished just i need only
Config tips for Nexus 5k for New server
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Jun 18, 2012
We've gotten two Nexus 7009's in and I'm starting to configure them when I found I couldn't add VDCs. I found there was no license installed but the only licenses I found that came with them are "Cisco DCNM for LAN Enterprise Lic for one Nexus 7000 Chassis". So my question is this - do I need to configure a DCNM server to get the license pushed to these two 7009s or should there be another PAK for each chassis that I can register and get my enterprise services?
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Jun 8, 2013
We have 2 nexus 7010 switches configured with HSRP in the network. For all the vlans core1 is Master and Core2 is standby. In the current setup we have external dhcp server and dhcp relay is configured for all the vlans on Master and standby switch. The setup is running the IOS 5.2
Activity Done: During the Maintainacne activity, we isolated core1 switch in the network by disabling the vpc/keepalive and all the uplinks from access switch. The core2 switch was master for all the vlans.
Issue observed: It has been observed that new users were not getting ip address from the dhcp server. The ethereal capture showed that dhcp server was not getting the dhcp requests from the core2 switch. We disabled the dhcp feature in core2 and enabled again with dhcp relay again configured on vlan interfaces .even after doing this no change was observed in behaviour. Finally we got core1 back in network by enabling all the links.
Observation: The moment VPC link came up between the core switches, users started getting ip's from dhcp. Then we started enabling all the uplinks on core1.Core1 again become master for all the vlans and users continued getting ip’s. Network running fine.
Further Testing
1. For one of the vlan, core 2 switch has been made primary and for new users checked the dhcp functionality and it was working fine. The aim was to identify if anything wrong on core 2 related to dhcp relay
2.Again we changed the priority for this vlan and made core1 master for the same. This time we disabled this vlan on core1 and tried new user with core 2 became master and dhcp functionality worked fine for new user. Actually in this case we have simulated the same behaviour when we observed the issue with only difference of VPC was not available during the issue time as core 1 was isolated form network
Inputs needed.
Is there any known behaviour for dhcp functionality when VPC is unavailable? If we see the test scenario2 (wherein core1 was master for the vlan and we disable this vlan on core 1 and core 2 was able to relay dhcp requests for new users in this vlan.) it was actually same as scenario we observed during issue time..
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Oct 11, 2012
Need clarification on the VPC with 5k and 2248 Fabric Extenders. My question is can each fabric extender uplink to two different 5ks, and at the same time, have servers connected to two both fabric extenders with a VPC.So basically, the server NIC will team with two different fabric extenders, and each fabric extender will connect to two different 5k's.
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Nov 17, 2011
I am in the process of migrating our existing server farm subnets to our new Nexus server farm and I discovered something I wasn’t expecting. My intention is to migrate our existing legacy server farm which is comprised of for paired 3750 switches off of our core 6509s and onto the Nexus and connect them to the 2232s via multi gig port-channel connections, two port channels per switch stack.
NOTE this is expected to be a temporary move as next year we intend to install additional N2Ks and move servers over to these directly. But to minimize the outage/downtime it will be better to move the subnets and switchs all at once.
These connections would be grouped 1 gig connections as port channels, one from each switch into one of the two 2232s.
Problem I discovered is Cisco does not intend to have switches connected to the Nexus and it immediately disables the ports when they see BPDUs.
I found a config that does work and it does fail over from one port-channel connection to the other but with the limitation that when the original port channel comes back online it does not fail back over to the original one, an acceptable situation for us. But I am wondering if Cisco would support this design if we did experience issues down the road.
The only issue I really see is to get it to work the config is different on the two N5Ks, see the pert config below for the connections. Both are running the same OS
augs1-ba-ar17# sh ver
Cisco Nexus Operating System (NX-OS) Software
TAC support: [URL]
[Code].....
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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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Nov 24, 2011
I have nx2000 boxes connected to nx7000 fiber module. There is a intermittent error occuring on nx7000 fiber module.
7000 fiber module drops down and all NX2000 boxes lose connectivity. When 7000 fiber module comes up, some equipment, not all, can not be reached through console port via network. These equipment are datacenter air conditioner console port, storage controller console port (iscsi controller interfaces run fine). It seems that handshake between these equipments and NX2000 ports are not fine.
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Dec 13, 2011
From the multiplexer 9 ethernet connections are terminating in Cisco 2960G 24 port swith and it is connected through fiber uplink to one Cisco 3560G 48 port switch in first floor, which is connected to server.
How I will configure the 3560G to make communicate with 2960G and bring all these 9 ethernet connections to server. All the 9 connections are from different IP. and server also have different IP.
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May 14, 2012
I have a Win 2003 server set up as my DHCP server. It is connected to port 13 of my SRW2048 switch.
Every port from 1-12 and from 25-36 get a "Limited or No Connectivity" error when I plug an ethernet cable in them from a computer (Win XP). However, all of the other ports receive an IP address and connect to our network just fine. I've noticed that they are all in the two right hand banks of ports,though, so I'm in need of assistance as to how I can get the first two banks of ports to behave the same way. In other words, I want all of the ports on the switch to be able to populate an IP address from the DHCP server attached to port 13.
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Aug 10, 2012
Is it possible to use 1GB (SFP / Copper) on the built-in 8 x X2-10GB ports without any Network Module of 1/10GB. If so how.
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Oct 30, 2011
Our customer is experimenting really bad performance when running 10Gig traffic through FWSM on C6509. Test with1 Gig traffic are providing find result perfromance as expected in this document: url... I have made a simple drawing so everyone can understand the setup:
The issue is when running 10 Gig traffic between Netapp servers. This traffic is going though the FWSM and the perfomance are really bad: around 50 Mbit/sec. If the traffic is not going though the FWSM ther performance are around 900 Mbit/s.
The customer and I think that the issue is releated the buffer in the C6509 and the FWSM which has big trouble managing 10G to 1G traffic convertering between C6509 and FWSM 6 G etherchannel connection.
When running 10G traffic through FWSM the number of output drops are increasing as you can see on the output bellow. The last thing which is wired a is that the speed is showing 1000 Mbits and not 6000Mbits. [code]
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Jan 16, 2012
I have a problem where only the 2950's switches go transperant. They drop VLAN1 thus no CDP snmp packets. The users keep working fine but our NMS center keeps calling me at 3am when this happens.
These are access switches that connect to stacked 3750's. Some of the uplinks are using media converters that i have been trying to get removed. But i doubt that it could be the cause of the vlan1 going down.
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Nov 20, 2012
Having an issue with my WLC 5500 and client connectivity. This just started today. Clients will connect for a short period of time and then drop off. WLC appears fine with the exception of a bunch of trap errors. I've rebooted the WLC but this did not clear the issue.
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