tag:blogger.com,1999:blog-2831734874452137784.post1819023794044468877..comments2024-03-26T05:37:05.321-05:00Comments on Stupid Router Tricks: Configuring vPC (Virtual Port Channel) with Cisco NexusAnonymoushttp://www.blogger.com/profile/03214361072499621156noreply@blogger.comBlogger24125tag:blogger.com,1999:blog-2831734874452137784.post-78313701425185025902022-03-15T00:06:51.264-05:002022-03-15T00:06:51.264-05:00sage 50 wont update
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Excuse my English.
If i change the port v...Hello.<br /><br />Excuse my English.<br /><br />If i change the port vlan on nexus 2000 in N5K-1 also going to have to change the configuration in the N5K-2 too? <a href="http://whatsmyrouterip.com/" rel="nofollow">access router</a><br />Anonymoushttps://www.blogger.com/profile/06677520634926721333noreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-92176883738466321552016-10-17T18:53:10.650-05:002016-10-17T18:53:10.650-05:00I want to have Nexus home lab with VPC capable.
?
...I want to have Nexus home lab with VPC capable.<br />?<br />1. can I just use 2x Nexus 5k without FEX<br />2. any cheaper alternative other than 5k for VPC<br />3. can 1x 5k doing like VRF, so I don't have to buy 2x 5k<br />tqnbctcphttps://www.blogger.com/profile/13691880285239358135noreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-60147005873610379462013-04-24T09:38:36.820-05:002013-04-24T09:38:36.820-05:00Hello Francisco,
Your English is fine :)
You are...Hello Francisco,<br /><br />Your English is fine :)<br /><br />You are correct. The port on the FEX that links to the two N5Ks should be configured the same on each N5K.<br />Anonymoushttps://www.blogger.com/profile/03214361072499621156noreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-76466434998938302642013-04-24T09:24:26.191-05:002013-04-24T09:24:26.191-05:00Hello.
Excuse my English.
If i change the port ...Hello.<br /><br />Excuse my English.<br /> <br />If i change the port vlan on nexus 2000 in N5K-1 also going to have to change the configuration in the N5K-2 too?Franciscohttps://www.blogger.com/profile/05252957218687458176noreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-43953569447731063132012-05-28T01:06:43.752-05:002012-05-28T01:06:43.752-05:00This comment has been removed by the author.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-49287490962650036282012-04-19T10:10:51.031-05:002012-04-19T10:10:51.031-05:00To answer your question of how one would determine...To answer your question of how one would determine what is dropping, what's causing drops, what applications are being impacted? Hmm... "I'll take network management for $200, Alex!"<br /><br />Joking of course!! :)<br /><br />I agree that it's difficult to glean that kind information from CAM tables and ASICs, but you'll probably agree that using management tools is the best method to begin determining issues on how network and applications are performing on a network. <br /><br />Valid as you may be in a particular situation, see my response to your last comment design points.<br /><br />Thank you for your comments.Anonymoushttps://www.blogger.com/profile/03214361072499621156noreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-13660899734223542092012-04-19T10:02:31.547-05:002012-04-19T10:02:31.547-05:00Hello again - Alan Harris, I presume? Your name no...Hello again - Alan Harris, I presume? Your name now shows as "Unknown"<br /><br />Alan, I agree with your GLBP assessment. However, when I linked the documentation for you, GLBP just happened to be at the top of the FHRP list. In my response, I addressed HSRP, as you indicated in your initial response. GLBP doesn't appear have the same interoperability with vPCs as HSRP/VRRP. At any rate, vPC configurations will ensure traffic does not unnecessarily traverse the peer-link with HSRP/VRRP. In that regard, the reverse path is indeed correct.<br /><br />Regarding your understanding of the MAC address table, the Cisco Nexus 5548P, which is what I had access to in my lab, provides an address table for 32,000 MAC addresses. That doesn’t mean one wouldn't still be VERY VERY careful about ever running this config on VMware, but then again, aren't we all VERY VERY careful about ever running anything in production? What I mean is; any investment in technology is driven by the return the business expects. Situations vary, and some technologies are better suited for some scenarios, and other technologies are better suited for other scenarios. The business need is going to drive what design I deploy in the real world.<br /><br />If you read this post or any of the other posts I've done, you'll find that I'm not selling something. I'm documenting the hands on configurations of scenarios I come up with. Why? http://www.stupidroutertricks.com/p/about.html <- My about page :)<br /><br />That being said, I hope you can agree that vPC is still a viable technology that combines the benefits of hardware redundancy with the benefits of port-channel loop management, and faster failure recovery than STP.Anonymoushttps://www.blogger.com/profile/03214361072499621156noreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-19740711339866478372012-04-18T17:49:43.735-05:002012-04-18T17:49:43.735-05:00The other thing to think about here is the sheer a...The other thing to think about here is the sheer amount of oversubscription this design introduces and how will you measure and monitor the oversubscription to know if you are creating congestion scenarios that are negatively affecting overall network and application performance.<br /><br />With the new Intel servers we are deploying all 10Gb to the server now, so I would assume this would be a FEX 2232 in practice. Then those connect to a Nexus 5548 with Integrated L3 and those uplink to a N7k in the core, also running L3.<br /><br />Thinking through this:<br />The FEX can be configurable oversubscribed bu best case is 32 ports facing hosts and 8 ports uplinked: 4:1 oversubscribed.<br />The Nexus 5548 is wirespeed, albeit a bit low on buffers for real world applications, but it has a 3:1 oversubscribed L3 module meaning I can use max 16 uplinks. So another 3:1 oversubscribed here.<br />The Nexus 7000 has only 80gb per slot on the 10Gb L3 modules that have decent buffering and routing table sizes (M1 modules) so those are either 64 ports wirespeed (meaning only 8 5548s can be wired up, or 4:1 oversubscribed if you use all 32 ports.<br /><br />4:1 * 3:1 * 4:1 = 48:1 oversubscribed.<br /><br />So given 48:1 oversubscription how would we determine what is dropping, what is causing drops, what applications are being impacted by congestion? It seems easier to reduce the FEX oversubscription with a real switch, and use a wirespeed box like a Nexus 3064 or Arista 7050 for the mid-tier and eliminate the management headache. You'd still have to deal with oversubscription between boxes based on links, but at least then we'd have the intelligence in the network to know what was being dropped.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-7415348734245180402012-04-18T17:39:55.870-05:002012-04-18T17:39:55.870-05:00From the core to access I agree with you. The flow...From the core to access I agree with you. The flow will go from 'the network' to Switch1 and assuming you are running L3 on the N5k and the ARP cache is populated it will direct the traffic to the appropriate host regardless of whether the traffic from the network gees to switch1 or Switch2. (The assumption that the ARP cache is populated can cause a lot of flooding if CAM ages and ARP is still populated btw)<br /><br />However I don't think the reverse path is correct - Traffic from your host that goes to FEX1 will then choose to go to either Switch1 or Switch2 based on a hashing algorithm. If you are running GLBP as your config guide indicates GLBP will 'salt and pepper' ARP responses so that some hosts direct their traffic to MAC1 and some MAC2 for the default gateway. (MAC1 is on Switch1 and MAC2 is on Switch2 to keep it simple) Since the EtherChannel hash is not aware of which MAC is active on which N5k in any fashion 50% of the traffic going 'up' will go to Switch1 and 50% will go to Switch2, however 50% of the traffic arriving at Switch1 will be destined for the MAC served on Switch2 and vice versa. This will have to be carried across the VPC spine link between the two N5ks causing ~50% of the traffic going 'up' to cross the VPC link - I think you'd need to plan for 16x10Gb x-linked for this design to work marginally well in production.<br /><br />Now the ARP table in the N5k is only capable of 8k entries to the best of my understanding, so I would be VERY VERY careful about ever running this config on VMware - as each vNIC takes a MAC/IP pair in the IP hosts table. If these fill up it will be packets everywhere and they are already 3:1 oversubscribed.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-23230406908201954452012-04-16T20:17:39.708-05:002012-04-16T20:17:39.708-05:00Hi Alan,
vPC configurations are optimized to help...Hi Alan,<br /><br />vPC configurations are optimized to help ensure that traffic is symmetric. For example, a flow reaching a Nexus switch from the core is forwarded toward the access layer without traversing the peer Nexus switch. Similarly, traffic from the server directed to the core is forwarded so that the Nexus routes this traffic directly to the core without unnecessarily passing it to the peer device. This process occurs regardless of which Cisco Nexus device is the primary HSRP device for a given VLAN. <br /><br />Here are a couple of links to documentation that elaborates much more on the subjects:<br /><br />Cisco NX-OS Virtual PortChannel: Fundamental DesignConcepts with NXOS 5.0<br />http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/design_guide_c07-625857.pdf<br /><br />Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 5.x - (FHRP - Configuration Guide)<br />http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/unicast/configuration/guide/l3_glbp.html<br /><br />I hope this helps!Anonymoushttps://www.blogger.com/profile/03214361072499621156noreply@blogger.comtag:blogger.com,1999:blog-2831734874452137784.post-33608444676127309462012-04-16T14:58:36.014-05:002012-04-16T14:58:36.014-05:00QQ- when the traffic gets distributed on the uplin...QQ- when the traffic gets distributed on the uplinks from the FEX to Switch1 and Switch2 how does it get to its default gateway? <br /><br />Let's assume we use the 3:1 oversubscribed module in the 5548 wouldn't ~50% of the traffic go to Switch2 and then have to cross over the VPC link between the 5548s to get to Switch1 where the HSRP/VRRP MAC/IP pair of the active default gateway was residing?<br /><br />This seems like it is sub-optimal and will cause significant traffic loss.Anonymousnoreply@blogger.com