Basic questions related to Networking

[Kuldeep singh]

Hello Experts,

There are some questions which is related to Cisco networking:

1. I wants to know which one is best for network to be used as DHCP Separate,

    Windows server or L3 switch (ip pool) ? Plz expalin with reason

2. Everyone knows that switch itself does not have a mac address but

    SVI have mac address then how can we check SVI mac address through

    command. 

3. if we use a router, it will have a mac address(only Ethernet not serial).

    suppose i connect one pc to router ethernet port then what status of mac

    will show at ethernet interface, will it be router predefined mac or computer mac ?

KS

[paul driver · Accepted solution]

Hello,

1. I wants to know which one is best for network to be used as DHCP Separate,

    Windows server or L3 switch (ip pool) ? Plz expalin with reason

I would suggest use a windows server- this is what a server is designed to do- as for the switch/router even though they can service this role, they are truly designed for the purpose of switching/routing so running a dhcp  takes valuable resources like bandwidth/cpu/memory.

2. Everyone knows that switch itself does not have a mac address but

    SVI have mac address then how can we check SVI mac address through

    command. 

Thats incorrect a switch does have a mac address - its a base mac- address, also each svi is alocated a mac address from this base address:

sh ver | in Base

Base ethernet MAC Address       : 00:11:5C:79:95:00

sh int vlan 250 | in bia

  Hardware is EtherSVI, address is 0011.5c79.9542 (bia 0011.5c79.9542)

sh int vlan 251 | in bia

  Hardware is EtherSVI, address is 0011.5c79.9543 (bia 0011.5c79.9543)

3. if we use a router, it will have a mac address(only Ethernet not serial).

    suppose i connect one pc to router ethernet port then what status of mac

    will show at ethernet interface, will it be router predefined mac or computer mac ?

The pcsand routers mac address will show so up in the arp table of the router when the pc is connected.

sh ip arp | in x/x

res

Paul

Please don't forget to rate any posts that have been helpful.

Thanks.

[Kuldeep singh]

Hi,

2. I read out about SVI that some switch's svi mac address are same

    in cisco 6500 switchs and some switchs like 3750 have different mac address for svi.

    It is not clear to me plz explain with good example.

3. you mean to say, router ethernet port will show two mac address.

   one is Router ethernet port and other is pc mac. Plz correct me if i am

   wrong.

KS

[Kuldeep singh]

Hello Experts,

plz see

[mark4carter · Accepted solution]

3. you mean to say, router ethernet port will show two mac address.

one is Router ethernet port and other is pc mac. Plz correct me if i am

wrong.

If you use the show interfaces command, the router will only display MAC address of that interface...

Router4#show interface fastethernet 0/0

FastEthernet0/0 is up, line protocol is up

  Hardware is Lance, address is 000C.5754.6725 (bia 000C.5754.6725)

the show arp command will display both...

Router4#show arp

Protocol  Address          Age (min)  Hardware Addr   Type   Interface

Internet  10.1.1.1                -   000C.5754.6725  ARPA   FastEthernet0/0

Internet  10.1.1.15               3   000C.7988.2251  ARPA   FastEthernet0/0

[Steven Williams]

DHCP really depends on what you are doing. I have used a centralized Windows server for DHCP of clients, but then use routers with DHCP for phones at different sites because of SRST purposes.

[Kuldeep singh]

Thanks pdriver and Mark,

My question 2 is still pending,

2. I read out about SVI that some switch's svi mac address are same

    in cisco 3550 switchs and some switchs like 3750 have different mac address for svi.

    It is not clear to me plz explain with good example.

KS

[paul driver]

Hello
switches have cam tables where mac-address are stored.

On the 6500's each vlan will use the same mac-address as you have pointed out but each svi vlan has it own cam table which then allows mutiple addressing to use the same base mac-address and avoids duplicate addressing.

res
Paul

Sent from Cisco Technical Support Android App