when configuring the ip address of a port on a router , we can use the "secondary address" command to configure more than one ip address to the port , my question is what's the purpose of using another address on the port , and is there any limiations of numbers of the ip address on the port
The use of a secondary address (also called multinetting) lets you share multiple IP subnets per physical network segment. This is usually used for when your migrating from 1 address scheme to another address space and old address removed after moved over to new addressing.
Some folks do thie extensively for some reason (give different departments different IP space yet use same wire, etc). this really isn't good design. Can't think of any reasons for doing this on a long-term basis, especially in todays world with VLANs, dot1q/isl, etc.
You can have as many as the routers memory can handle... their probably is a limit of 255 but maybe not.
Routing protocols and other services running on router use the primary IP address to source packets from. This can be changed for a few things but not all.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...