Knowledge base

Fix it at 2 a.m. without waiting for us.

Everything here comes off real call closures — access and core switching, routing, firewalls, CCTV and links, across the platforms we deploy. Commands are given for the vendor that phrases it differently, because that is usually the part people get stuck on.

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20 articles

L2-001Field fix · 5 min

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Fix it at 2 a.m. without waiting for us.

Port is in err-disabled state and will not come up

PoE camera or AP will not power up from the switch

Whole VLAN goes slow or dead — suspected switching loop

Device works on one port but not another — VLAN or trunk mismatch

Link is up but throughput is terrible — errors on the interface

OSPF neighbour stuck in EXSTART, INIT or 2-WAY

Gateway redundancy not failing over — HSRP / VRRP

Stack split or a member missing after a reload

Inter-VLAN routing works one direction only

Internet down at a branch — is it the link or the router?

Dual WAN not failing over

Some sites load, others hang — MTU and MSS

IPSec tunnel is up but no traffic passes

Port forward / DNAT not reaching the internal server

Traffic blocked and you cannot tell which rule did it

Firewall CPU or session table maxed out

Cameras drop off the NVR intermittently

Recording retention is shorter than contracted

Camera reachable on the network but no video in the VMS

Point-to-point link is up but throughput is far below spec

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