cat & compressed files

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In a NOC/SOC environment you have to frequently deal with gigantic log files. These huge logs (composed of simple text lines), if compressed, can be reduced up to 10 times their size, so we will find them on our syslog in compressed formats (zip, gz, tar). When you need to do troubleshooting it is unthinkable to have to unzip all …

Mikrotik CHR Crash under VirtualBox

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On some Linux distribution Mikrotik CHR hosted by VirtualBox 6.0 can crash and reboot mysteriously. On console may appear this message: Workaround: Access on VirtualBox Network Settings For all adapters of Mikrotik CHR choose PCnet-FAST III (Am79C973) as virtual adapter. Start VM and check! bye .glitchlist crew

Cisco 3750X & VMware

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If you have to connect VMware server to a Cisco 3750X Stack via Port-Channel consider this: In Cisco, the default PVID is 1 In a Cisco trunk the PVID pass untagged VMware virtual switch tag VLAN 1 on a trunk Default channel-group is EtherChannel So if you pass many VLAN (id. 1 included) on a trunk interface this is the …

Routers diagnostics

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to make a complete deep diagnosis of your router one of the most complete tools is: Sometimes the generated file is asked by vendors when you open a Cisco TAC or a Huawei CASE. The output of these commands is very large so on Huawei you can add the filename option and export the file via TFTP, while for Cisco, …

Huawei – eBGP sensitive interface

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by default a BGP session do not shutdown until the Hold timer times out. In Huawei Keep-alive is 60s and Hold-time is 180s. So if we are in multi ISP environment and internet peer go down, the networks preferred by the failed peer are black-holed. With the command: ebgp-interface-sensitive The BGP router clear the peer session immediately if the interface …