Tag Archives: Cisco Catalyst 3850

Cisco Prime: Catalyst 3850 image archiving

It’s been a while since I’ve posted anything on my website. I had a crazy year, had a lot of work that ruined all my plans to study a lot. Hopefully it’s now sorted with my management and next year is promised to be much better from the work/life/study balance perspective. I know I wasn’t a best webmaster and didn’t respond to many of your comments – I promise I will improve and reply to all comments in the coming weeks. I am going for WISECURE exam in less than two weeks from now, so wish me luck.

In the meanwhile, I’d like to share an undocumented feature of Cisco Prime (well, at least I wasn’t able to find any guidelines on that in Cisco Prime documentation). I have recently configured Prime for images archiving, but few days later realized that it fails to copy images from Catalyst 3850 switches. All transfer modes have been failing – FTP, SFTP, SCP and TFTP. There are no settings in Prime that relate to SCP and SFTP (you can only enable/disable FTP and TFTP servers). I’ve done some research and found that for SCP downloads Prime is acting as a client. Therefore, Catalyst 3850/3650 switches must be SCP servers.

To enable SCP server on Catalyst 3850/3650 execute the following global configuration command:

ip scp server enable

Once applied, Prime will be able to archive IOS-XE images from Catalyst 3850/3650s. However, there is restriction. Cisco Prime cannot archive an image from Catalyst 3850 if it was installed using INSTALL mode. That is, when BIN package is unpacked into few separate files. Only BUNDLE mode is supported for archiving. Not great huh? Cisco does not recommend to use BUNDLE mode for image distribution on Catalyst 3850s, but at the same time Cisco Prime can’t archive image if it was distributed using recommended INSTALL mode.

Cisco is so Cisco…

Catalyst 3850 QoS Troubleshooting Commands

You would expect to have a very simple and intuitive QoS troubleshooting toolkit on a native MQC platform. Well, the first thing that came into my mind after I’ve been told that Catalyst 3850 is a proper MQC platform was something like

Wow, finally I can use the very same range of ISR commands to troubleshoot QoS on a hardware switching platform!

Unfortunately, that ended up to be a hybrid implementation. Yes, we have to use MQC to configure QoS on Catalyst 3850, including queuing! No, you are unlikely to solely use MQC commands to troubleshoot QoS. Remember that show mls qos commands range on Catalyst 3750 platform? It’s still the same candy, in a different wrapping though. Read more …

Catalyst 3850 Flexible NetFlow restrictions

Cisco Catalyst 3850 has become a next generation switching platform in our company. We have deployed these switches in a number of our offices recently. Apart from being a converged wired/wireless access platform, it fully supports Flexible NetFlow. Therefore, it was a logical step to begin using this neat feature at least on our branche core switches to improve monitoring capabilities and lessen troubleshooting efforts. I have faced a number of issues while I’ve been trying to configure FNF on the first switch to perform some testing. So… Read more …