Perhaps another trivial post, but if you don’t know about it, you might find it extremely useful.
Cisco NX-OS has an on-device log file of the exec level configuration commands entered successfully. Obviously similar informational can be obtained from the TACACS logs, but there is a certain benefit in having directly on CLI.
The command is:
#show accounting log
Continue reading “Nexus Accounting Log”
This is a interesting but a trivial post. Everybody know about the interface command “load-interval” that changes the time period over which the interface packet-rate and throughput statistics are averaged.
I discovered an addition to this command on the Nexus the other day while poking around. NX-OS allows multiple counter intervals to be configured on the same interface. This allows different sampled intervals to be listed at the same time.
The configuration is easy:
load-interval counter 1 40
load-interval counter 2 60
load-interval counter 3 180
Continue reading “Nexus load intervals”
When upgrading a Nexus 7000 to NX-OS version 5.2 (using more than 1 VDC) or to NX-OS v6+, Cisco claims the need to upgrade the system memory to 8Gb.
Note I have run on v5.2 using only 4Gb per SUP using 2 VDCs and it has worked just fine, but I should mention that the box was not under heavy load.
See how much memory your N7K has on a SUP by using the following command:
N7K# show system resources
Load average: 1 minute: 0.47 5 minutes: 0.24 15 minutes: 0.15
Processes : 959 total, 1 running
CPU states : 3.0% user, 3.5% kernel, 93.5% idle
Memory usage: 4115776K total, 2793428K used, 1322348K free
The upgrade per SUP would need the Cisco Bundle upgrade package (Product code: N7K-SUP1-8GBUPG=). One package has one 4Gb module. (see picture below) If you have two SUPs you would need two bundles. Notice the 8Gb sticker on module in the red block.
I am a MAC user and I have been looking but could not find a OmniGraffle Stencil with the Cisco Nexus icons, so I ended making one.
I have also submitted the stencil to Graffletopia.com
Feel free to download it and from Graffletopia or Mediashare:Cisco Nexus Hardware.gstencil.zip
Cisco is known for the inconsistencies between platforms and different IOS versions. I came across another that was rather annoying. Now between linecards.
Trying to configuring the following standard sub-interface Ethernet AToM tunnel on a Cisco 7606 with a ES+ linecard:
encapsulation dot1Q 2
no ip redirects
no ip directed-broadcast
no ip proxy-arp
xconnect 10.5.0.99 12345 encap mpls pw-class CISCO
Yields the following misleading error…
7606(config-subif)# xconnect 10.5.0.99 12345 encap mpls pw-class CISCO
MPLS encap is not supported on this circuit
Continue reading “Cisco and their inconsistencies”
It is not uncommon to find that different vendors have slightly different implementations when it comes to standards technologies that should work seamless.
I recently came across a BGP capability negotiation problem between a Nexus 7000 and a client Fortigate. Today’s post is not teaching about any new technologies, but instead showing the troubleshooting methodology I used to find the problem.
The setup is simple. A Nexus 7000 and a Fortigate connected via nexus layer2 hosting infrastructure, to peer with BGP.
At face value the eBGP session between Nexus 7000 and the Fortigate never came up:
N7K# sh ip bgp summary | i 10.5.0.20
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
10.5.0.20 4 65123 190 190 0 0 0 0:12:30 Idle
The first steps should verify the obvious.
- Configuration! This check should included checking the ASNs, the peering IP addresses, source-interfaces and passwords matching.
Continue reading “BGP between Cisco Nexus and Fortigate”
I previously wrote a post about the Nexus Roles and how they integrate with a TACACS server.
Cisco Documentation shows the following format to issue multiple roles from a TACACS/RADIUS server.:
We are using Shrubbery TACPLUS, instead of the Cisco ACS software. Last week I noticed that only one role was assigned when multiples should be assigned. Multiple roles are required when using one TACACS server to issue roles for VDC and non-VDC Nexus switches since they need different default User-Roles.
This was tested on a Nexus 5000, a Nexus 7000 and VDC on the same Nexus 7000. Different codes were tried. This was not a NX-OS bug.
Upon further investigation it was obvious, that the syntax above as provided by Cisco was specific their TACACS software, being the ACS software. But I still required multiple Roles to be assigned for my single TACACS configuration to work across multiple Nexus devices. First attempt was the lazy method. Ask uncle Google for any such encounters with a solution. That yielded no practical results. I then contacting Shrubbery for the solution, after that it became clear that possibly nobody else have experienced this problem before.
So the hunt began to find out exactly what was so different in the AAA response from the Cisco ACS software to the TACPLUS software that it did not yield the required results.
Continue reading “Cisco Nexus User Roles using TacPlus”