Offset list is use to modify the metric of all or specific incoming/outgoing routes. If we want to change the metric of specific routes then we can create a access-list. After that we can call it under offset-list. A offset-list doesn’t care that route is being advertise or not. Offset-list will just modify the metric… Read More »
DHCP snooping acts like a firewall between DHCP servers and un-trusted host/ports. It validates the DHCP messages received from un-trusted ports and filter out the invalid messages. Un-trusted ports are all host ports in a VLAN. which is configure for DHCP snooping. Trusted ports are ports connected to router, switch and server. DHCP snooping creates… Read More »
Spanning-tree BPDUs are a one way process. Means, a switch can only send the BPDUs for announce itself. But it can’t expect the response of these BPDUs. We can change this behavior by using the Spanning-Tree Bridge Assurance. bridge assurance enables the two-way BPDU communication. All operational ports will send the BPDUs , including the… Read More »
Below is the Ethanalyzer for data palne. For control plane please click on green button below: By default, wireshark or ETH is used to capture the control plane traffic. But we can also capture the data plane traffic by creating ACLs with log keyword and then apply the ACL on interface. In this case, control… Read More »
Nexus has its own in-build wireshark feature(Cisco Nexus Packet Captures With Ethanalyzer) which is called ETH. By default, It can capture maximum 10 packets. But we can configure it for more using limit keyword. By using this feature, we can capture both incoming and outgoing traffic from CPU or only incoming traffic from CPU or… Read More »