Changing Port Speeds on a 5520-VIM-4YE VIM Module in 5520 Universal Hardware Switch

The 5520-VIM-4YE, this has 4 x SFP28 ports 10/25. You can use 10Gbit or 25Gbit speeds on these ports. On an Extreme 5520 Universal hardware switch this will be ports 57-60 (on 48port model) or 33-36 (on a 24 port model) If you want to use 4 x SFP+ modules running at 10Gbit, you need […]

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MTA-STS (Mail Transfer Agent Strict Transport Security)

Emails crossing the internet use secure connections encrypted using Transport Layer Security (TLS). However, there remain vulnerabilities in this method of protecting the confidentiality of emails, whereby a person-in-the-middle can trick incoming connections to send to another server and/or send information in the clear. MTA-STS is a standard designed to address these vulnerabilities and is […]

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Extreme Networks X695 – 40Gbit, 100Gbit QSFP(28) Ports and Port Paritioning Explained

The Extreme Networks X695 switches have a special port configuration arrangement that you need to be aware of when configuring the switch for use. Verified on: ExtremeXOS version 30.6.1.11 30.6.1.11-patch1-4 by release-manager on Tue Jul 7 10:36:05 EDT 2020 The switch supports the following: 48 x SFP28 1Gb/10Gb/25Gb Ports 8 x QSFP28 40Gb/100Gb Ports Up […]

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Extreme Networks Switch – “Error: VLAN Default cannot be disabled because it is configured for an L2 Protocol.”

It is pretty standard practice to disable the default VLAN and renumber its tag ID for security reasons, from version 22.4 and above we often go this issue when performing these basic commands: We’d get the error as below. In our case we don’t want to run STP (Spanning Tree Protocol) because we’re using either […]

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Monitor Rx and Tx Errors on Extreme Networks Switches via SNMP Query (using NagiosXI)

It is helpful to monitor the RxErrors and TxErrors on ports on Extreme Networks switches to get a heads up on any issues before they begin to impact service. The Extreme Networks MIB can be downloaded from the Extreme Networks support portal to assist you in finding the relevant SNMP OIDs, the below is an […]

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Kemp Load Master and Palo Alto Firewall – Random Packet Drops and Disconnections

We had a rather irritating issue whereby we were seeing intermittent packet drops and connection failures on our Kemp Load Master. The Kemp Load Master sat inbetween a Palo Alto Firewall within a DMZ zone. Client connections from the Internet would be directed to the Kemp Load Master in the DMZ, which would then make […]

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