Routing

[SathishkumarSaravanan0348]

Hello Experts,

What is meant by the routed ports?

What is the difference between ICMP server and SNMP server in functionality wise? 

Regards,

Sathish.

[Martin L]

I guess you can say that any interface that shows up int the routing table is called routed port. 

ICMP server ?  not sure if I seen one ever 

[luis_cordova]

Hi @SathishkumarSaravanan0348,

A Layer3 switch comes by default with Layer2 features.

On these switches, you can enable routing using the ip routing command.

In that state, IP addresses cannot be assigned to physical ports, but virtual interfaces (SVIs) can be routed.

In order to enter IP addressing to a physical port, you must remove the functions of Layer2 using the no switchport command.

A port of a Layer3 switch, without Layer2 functions, is called a routed port.

ICMP is basically a protocol to test connectivity, closely related to ping.

https://community.cisco.com/t5/networking-documents/icmp-internet-control-message-protocol/ta-p/3116636

SNMP is a protocol that allows the management of the devices.

Basically, through this protocol, the devices send packets with management information to a server, so an SNMP server is the one that receives this information and processes it for us.

https://www.cisco.com/c/en/us/td/docs/optical/15000r/dwdm/configuration/guide/b_snmp.html

Regards

[SathishkumarSaravanan0348]

Thanks a lot for the information. Is there any command to enable ICMP in cisco devices? How it works?

[luis_cordova · Accepted solution]

Hi @SathishkumarSaravanan0348 ,

The ICM portocolle is enabled by default in most network devices:

PC:

Router:

Regards

[Joseph W. Doherty]

"What is meant by the routed ports?"

That's the term generally used for a L3 switch port that's configured like a router's port rather than like a L2 switch's port.

"What is the difference between ICMP server and SNMP server in functionality wise?"

There's many differences. ICMP is a protocol for communications between network devices that provide information about what's going on about the network. For example, ping and traceroute are part of ICMP. When a packet has the DF bit set and a router would need to fragment the packet, sending a notification to the sending host is also part of ICMP. For more information, you might want to read: https://en.wikipedia.org/wiki/Internet_Control_Message_Protocol.

SNMP, though, is a protocol used to obtain information and/or manage a particular host. The host to be "managed" requires a SNMP agent running on it. A host (server) dedicated to "managing" other hosts would be a management station. Unlike ICMP, which deals with network issues, SNMP can deal with almost anything happening on a particular host. For example, how busy is a host, how hot is the inside of the host, etc. You can find more about SNMP here: https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol