Filtering traffic with vlan access list

Topology Lab setup Linux 2 belongs to vlan 10. Linux 3 and 4 belong to vlan 20. Router is the dhcp server for vlan 10 and 20. A default route goes from Router to the internet where the web application DVWA resides. VLAN 10 subnet and VLAN 20 subnet Damn Vulnerable Web Application … Continue reading Filtering traffic with vlan access list



Stack master election criteria The criteria is in order, if the first criteria does not meet the second criteria will be the tie breaker. 1. The switch that is configured with the highest stack priority. 2. The switch that is not using the default configuration. 3. The switch that is using a higher priority IOS, … Continue reading Stackwise

Multiple Spanning Tree Protocol (802.1s)

This protocol is inspired by Cisco proprietary Per-Vlan Spanning tree plus (PVST+). Cisco PVST+ creates an STP instance for each Vlan. MSTP has more flexibility than PVST+, MSTP instances can map unlimited number of Vlans. MSTP supports 16 STP instances. When MSTP is enabled, RSTP is essentially enabled as well. The disadvantage of PVST+ is … Continue reading Multiple Spanning Tree Protocol (802.1s)

Spanning Tree Protocol (802.1D)

This protocol prevents bridging loop created by redundant links within switch network. STP calculation will make switch/es block its own port so that the switch path is one straight line and not a loop. This is perhaps the most confusing concept in switch, it is not extremely difficult but many terminologies and the method on … Continue reading Spanning Tree Protocol (802.1D)