Cisco Switching/Routing :: Implementing Jumbo Frames On Nexus 5548
Apr 16, 2013
The server team has asked me to implement jumbo frames on a single VLAN, the one they use for v motion. We have two pairs of 5548s, each pair running VPC for most connections. I am aware of many postings that describe how to enable jumbo frames globally, like this:
policy-map type network-qos jumbo
class type network-qos class-default
[code].....
I am not clear how I can extend this principle to one VLAN only.
Also, I am aware of a posting [URL], that shows some pitfalls of implementing jumbo frames in a VPC configuration. Pretty well all my connections are VPC, including all the FEXes, which are all dual-homed. In many cases, the VPC extends through to the servers so that the servers run port.channels across two FEXes. I am unclear whether the pitfalls are still valid, or whether I have to wait until my next maintenance slot (6 months away) to implement jumbo frames. Can jumbo frames be implement safely on the fly? How does enabling jumbo frames fit in with "conf sync" mode?
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Mar 24, 2012
According to this Cisco URL jumbo frames should be put into play by changing default ethernet system class.
Recommended configuration:
!--- You can enable the Jumbo MTU
!--- for the whole switch by setting the MTU
!--- to its maximum size (9216 bytes) in
[Code].....
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Dec 8, 2012
I've to enable it on 3750 and nexus 7K switches. what are the steps involved? can we enable jumbo frame per port instead of enabling globally? i.e. we will only have few ports that will be using jumbo frames, rest of the ports will be using default 1500 MTU size.
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Apr 16, 2013
We have a requirement to send span traffic to a destination port for monitoring purposes on two 5000s with some 2000 fex boxes attached.
Some of the servers are making use of frames larger than 1500. we have not changed any mtu configuration on the 5000 since installation, and I can see the policy maps is still on 1500.
My first assumption would be that frames larger than 1500 will not be dropped, but it seemingly not (see below). is there a reason why the switch would forward jumbo frames? Also, is there a limitation on MTU for span traffic? There is a MTU command under the span session, but the maximum is 1518. From what I can read the frame will be truncated if it exceeds this. Does that mean the fragments will be dropped?
RX
7495685816 unicast packets 249 multicast packets 147899 broadcast packets
7495833963 input packets 1426823388087 bytes
1608134 jumbo packets 0 storm suppression bytes
[Code]....
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Jul 5, 2012
I believe i've enable jumbo frames on our Nexus 7010, one in each data-centre.
system jumbomtu 9216. Also on the interfaces mtu 9216. And can see MTU 9216 bytes, BW 20000000 Kbit, DLY 10 usec on the port-channel between them. Though when i ping between vlans at each site with large packets i get 30% drops and if i set the DF bit in IP header to yes - 100% loss.
8798 bytes from 10.200.12.2: icmp_seq=19 ttl=254 time=8.024 ms --- 10.200.12.2 ping statistics ---20 packets transmitted, 14 packets received, 30.00% packet loss
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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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Sep 17, 2012
We are currently using two Nexus 5548UP's as our Datacenter Network Core. I have a pretty simple objective: I would like to enable Jumbo Frames on a single VLAN only(VLAN 65). This VLAN is used strictly for backups. I do not want to enable Jumbo Frames on the other VLANs(VLANs 1-10). Im not sure what the best way to do this is.....or if it is even possible but I am hoping to get some configuration examples.
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Nov 22, 2011
I attempted to enable jumbo frames on a Nexus 5010 (NX-OS version 4.2(1)N1(1)). I created the policy map below and lost access to the switch.
policy-map type network-qos jumbo
class type network-qos class-default
mtu 9216
After recovery I see from the logs that all vlans and interface were suspended. I've attempted to look for reasons for a compatibility issue but I am unable to find what is checked and what could have been incompatible. The other troubling thing is the adjacent switch suspended its interfaces too but no change was done there. What I need to look out for so that this does not happen again?
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 1,10,601 on Interface port-channel1 are being suspen
ded. (Reason: QoSMgr Network QoS configuration incompatible)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-5-IF_TRUNK_DOWN: Interface port-channel1, vlan 1,10,601 down
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 10 on Interface port-channel508 are being suspended.
[code]....
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Jun 11, 2012
I currently have 4 3560 switches connected in a Mesh topology. These are all set to use Jumbo Frames and so are all the Servers that are connected to these.I now need to connect a 2950 switch to 2 of the 3560's which will have only desktop computers connected to it but i do not want to configure Jumbo Frames on this and any of the desktops.
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Oct 25, 2011
I understand that jumbo frames need to be enabled end-to-end. I have two ESX hosts connected at each site. I want to enable jumbo frames for those ports, but what if not all host on the ESX are using jumbo frames, will I have drops and connection failures? So if i have two sites, each with a 6509 connected via a trunk and need to enable jumbo frames for a vlan between the sites how do I accomplish this?If I enable jumbo frames on the trunk link how does that impact other traffic between the sites?
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Dec 2, 2012
I have a Cisco Catalyst 3100 blade in a Dell server chassis that is trunked to a 6509.
When doing a protocol capture, I see large frames being sent from one of the servers in the chassis.
Example:
TCP:[Continuation to #1701] [Bad CheckSum]Flags=...AP..., SrcPort=HTTP(80), DstPort=2667, PayloadLen=2831, Seq=1489611217 - 1489614048, Ack=1719592331, Win=65535
I see lengths up to 6900+ bites coming from the server.
The switch has the global MTU set to 1500
system mtu routing 1500
and I can't seem to set this at the interface level. The server is configured to send 1500 length frames. Why am I seeing these jumbos? (the server is Windows 2003)
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Mar 1, 2011
I have a pair of Catalyst 3560 GB switches that are trunked with two of the standard ports, and that have trunk ports connecting to a failover pair of PIX 515e's. We're considering adding a pair of cluster database nodes and an iSCSI SAN, both of which would need a dedicated interconnect VLAN that I'd like to employ Jumbo frames on. I don't necessarily need the VLANs to traverse the firewall trunks since they're private interconnects, but I need each host to traverse the switch trunks.
Since it seems I can only enable Jumbo frames on the entire switch (current standard frame size is 1500 and jumbo is also 1500), when I enable it what kind of possible negative impact could this have on my trunked ports as well as my host connections? I've read mixed reviews of users with iSCSI SAN devices seeing terrible performance when enabling jumbo frames so I'm apprehensive about enabling them on an existing network.
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Oct 14, 2012
We have a number of sites which have high-speed L2 links which terminate on our L3 switches at each site. The ports are between the sites are placed in routed mode.
I would like to use Jumbo frame between two of the network which will communicate across sites and 1500 mtu on the rest, is this something which is possible?
From my understanding is the mtu is set on the interface therefore if I set the mtu on the L2 link ports on both sites to 9000 then would this cause a problem for the 1500?
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Nov 17, 2011
I have a Nexus 7000 plus 6 boxes NX2000 on backbone.I have configured on 7000 :
conf t
system jumbomtu 9000
exitERROR: Ethernet111/1/1: requested config change not allowed
...
ERROR: Ethernet122/1/48: requested config change not allowed
1/111/14 is a NX2000 port conf tinterface ethernet 1/111/14 switchport mtu 9000 exit
I have gotten this message : Error: MTU cannot be configured on satellite port(s) - Eth122/1/11 ?I have tried on a NX7000 TP port:ERROR: Ethernet10/45: MTU on L2 interfaces can only be set to default or system-jumboMTU ?Does JUMBOMTU configuration can be done only when there are no NX2000 configured ?
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Oct 7, 2012
on some of our ports on Nexu 5000 and on the connected FEX we can see a lot of Jumbo Packets though there is not enableed any JumboFrame on the Switch, all Interface and system MTU is set to 1500.
DBE-LINZ-XX41# sh int Eth113/1/27
Ethernet113/1/27 is up
Hardware: 100/1000 Ethernet, address: d0d0.fd1b.b69c (bia d0d0.fd1b.b69c)
[Code]....
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Feb 7, 2011
I am trying to determin if Jumbo frames are enabled on out Nexus 7000, and I am getting mixed info back from the swtich.I looks like the system jumbo MTU size is 9216 by default, but the interfaces all say the MTU of the interface is 1500 bytes. According to this article, the interface MTU should read 9216 is the jumbo frames are enabled globally. Is this correct. Is there a way to verify if Jumbo frame support is turned on? [code]
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Feb 7, 2012
I have Nexus 5548UP, Version version 5.0(3)N2(2b), with a flat configured network. Customer has put several IP subnets on one Vlan. In one subnet is an Siemens SPS wich connects to a Server. This SPS is not reachable since I send a ping from the N5k, then everything works fine. Sniffering that port no arp requests from the N5k are captured. That hapens with every device (Siemens SPS) in the network. Every other clients and server are working fine and there are no problems.
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May 10, 2013
I have a Nexus 5548 Recently restart itself for no reason I ran the command:
sh system reset-reason
----- reset reason for Supervisor-module 1 (from Supervisor in slot 1) ---
1) At 469203 usecs after Sat May 11 14:02:07 2013
Reason: Reset triggered due to HA policy of Reset
Service: eth_port_sec hap reset
Version: 5.1(3)N1(1a)
sh processes log details
Start type: SRV_OPTION_RESTART_STATELESS (23)
Death reason: SYSMGR_DEATH_REASON_FAILURE_SIGNAL (2)
Last heartbeat 6.09 secs ago
RLIMIT_AS: 189894144
System image name: n5000-uk9.5.1.3.N1.1a.bin
I've been searching in Google/Cisco about the eth_port_sec hap reset and cannot find any reason, just something about the same error but in different technology:
[URL]
CSCub36000 #SNMP polling on eth_port_security objects no longer causes an eth_port_sec hap reset.I just to want to be sure, is the same reason...Or do you know something than can cause it on a Nexus Switch?
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Jul 29, 2012
We have just purchased and installed the L3 daughter card for our 5548UPs and have also installed the L3 Enterprise Services pkg. The problem is, I cannot enable the EIGRP feature even though we have the Ent Svc lic. After doing a little more research, I see that the Lan Base lic is required to enable the L3 card and many of the L3 features (the card is currently in an "offline" state).
From what I have read on this board, the Lan Base lic is a free license that should be included with the L3 daughter card -- however, Cisco licensing will not issue me that license without a sales order (even though a Nexus engineer said it was included, the licensing group will not issue with an official sales order). Well, our vendor ordered the card and the Ent Svcs lic but for some reason we were never sent a PAK for the LAN Base lic.
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Feb 12, 2012
using the 55xx as a L3 Distribution switch or even as a Core. By enabling the L3 features does it allow you enabled L3 SVI's for VLAN interfaces or are there interfaces on the daughter card that are used for routing instead?
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Jun 11, 2012
The Nexus 5548 is running 5.1.3.N2.1a and has the L3 daughter card (N55-D160L3)I have the EIGRP feature enabled. By the way, when doing a 'sh feature' four EIGRP features show up like this: [code] To create the L3 SVI, I go into config mode and attempt to type 'interface vlan 10'. but this doesn't work. These are the only options under the keyword 'interface':
- ethernet
- loopback
- mgmt
- port-channel
I must be missing something simple but can't seem to see what that is. What do I need to do in order to create an L3 SVI on this 5548?
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Aug 15, 2012
I want to configure management for some Nexus 5548's?I wanted to manage the switches via an SVI. I have read the following document which gives details about the Management SVI but doesn't answer all questions.[URL]I am not running any layer 3 functionality on the switch, no layer3 license (which it mentions in the above link) Will I still be able to create a management SVI. I know I will need to enable the feature 'interface-vlan' to setup a Management SVI, does that require a license?
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Sep 4, 2012
I encountered problem while trying to copy file from Nexus 5548 to my ftp server (proteus - 192.168.12.220 - the Nexus switch is able to resolve name proteus correctly to 192.168.12.220). See below the working and not working scenarios. I have serached through Cisco Bug Database but unable to find any related bug associated to this problem. This Nexus is running the following NX-OS version.
n5000-uk9-kickstart.5.1.3.N1.1a.bin
n5000-uk9.5.1.3.N1.1a.bin
Working (without specifying the username and full path)
[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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Jan 21, 2013
I need to upgrade the code on our two Nexus 5548's in order to facilitate the installation of a few FEX's, but due to the fact that seemingly all of my port-channels are in the STP DESG forwarding state, an ISSU upgrade is not possible. Everything connected directly to our 5548's are utilizing VPC's, including an HP Blade chassis, and several Netapp devices. If I follow the normal upgrade route, should I experience an outage, or should the secondary switch just continue passing traffic?
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Sep 18, 2012
I'm trying to setup SNMPv3 on a Nexus 5548. We are using SNMPv3 on 3750's without any issue, but haveing issues getting it setup on the Nexus.I have been using the following link for the setup following it line by line. [URL]The part that I'm having issues with is when I try to enforce SNMP message encryption on a per user basis. When I issue snmp-server user (username) enforcePriv, I get warning: unable to update CLI users database. reason: role does not exist grounp not found.
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Nov 20, 2011
I am using cisco Nexus5548 and trying to enter a snmp community, but it doesn't accept it. I enter a community name that is less than 32 characters, with symbols, numbers and letters.
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May 9, 2013
I am setting up a new environment with 2 5548's and some 2248TP-1GE Fex's and Im running into an issue. I have the peer link and peer-keepalive link that appear to be good. When I configure the fex and vpc for the fex manually on each switch without pre-provisioning the slot the fex comes online and everything appears to be good. I can see all the ineterfaces when doing a sh int br and the sh fex detail shows all good. When I do the exact same thing but pre-provision the slot the fex stays in an offline state. Ive tried disabling the port(s) connected to the fex while configuring everything then enabling them but same thing. [code]
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Aug 13, 2012
regarding PVLANs and the Nexus, my understanding is that we cannot configure Private VLANs on a FEX trunk port with a NX-OS release older than 5.1(3)N2(1) for the Nexus5548... Is there any known workaround for this limitation (appart from performing a SW upgrade)?
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Dec 12, 2011
I am working for an Air Force client and am adding a handful of 5548s into their network. My question is how Tacacs+ is configured. My hands are tied in regards to testing in an operational environment so I want to ensure the configs are correct prior to deployment/maintenance window and avoid any remote issues.
I have read the "Cisco Press - TACACS+" config guide and it was somewhat vague in regards to operational deployment.
My basic NX-OS configs are as follows:
- feature tacacs+- tacacs-server key 7 "002A52xxxxxxxxxxxxxxxx8"- tacacs-server host 128.xx.xx.xx timeout 10- tacacs-server host 128.xx.xx.xx timeout 10- tacacs-server directed-request
When I try to set the following command string, aaa authentication login default group tacacs+ local, the NX-OS asks me the input a "server group name". There are no server groups configured. Do I need them? Can I get by without configuring a group name because the client probably will not.
The Cisco IOS devices are configured with normal aaa authentication/authorization parameters. Also, do the VTY ports default to sshv2 and the correct tacacs+ parameters with the "transport input ssh" command (not available)?
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Jan 7, 2013
I am trying to install SFP-GE-T module on Nexus 5548UP Switch, but is giving the ‘SFP validation Failed’ error. The details of the switch is given below
Model : N5K-C5548UP-FA
The interface is configured with speed 1000 before inserting the module, still we are getting the same error. PFA logs for more details We have 8 Nos of SFP-GE-T modules , all are giving same error. We tried to insert the module on onboard as well as expansion module.
The same module is working fine on Cisco 3750X-24T-L Switch As per the Hardware installation guide , SFP-GE-T transciever is supported on N5K platform. Please extend your support in configuring SFP-GE-T module on N5K platform? We tried with SFP-GE-S module on the same switch , and the same is found working fine.
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Jun 10, 2012
I am trying to interconnect a pair of Nexus 5548 at adjacent sites, using 2 2960-S switches at each site, the reason being that the Multimode Fiber between the sites will only support 100mb and I need this up while I finish having SMF laid.
I have attached a diagram, just debating whether to use etherchannel or vPC - would like to hear some opinions...
Assume the interconnect between the 5548's needs to be 802.1q trunk
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Apr 26, 2012
just a simple question. Is it possible to use a nexus 5548 UP switch as a layer 3 router between different vlans on the switch without the layer 3 card ? Or is there no 5548 as a router with the layer 3 card ?
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