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TOPIC: router MAC

router MAC 8 years 11 months ago #32510

sry, just a noob question.. i was going thru the routing process and I am confused as to how many MAC address does router have ?

does routers every interface has a MAC address or Just a single MAC address..?? coz' i saw in some question that every interface in Router having MAC address..


another question..


in OSPF .what is the use of wildcard mask ??

# network 192.168.12.64 0.0.0.63 area 0

what does this mean ? i know how to calculate wildcard mask but what does this mean ?


thx, sry for the noob question.

Re: router MAC 8 years 11 months ago #32511

PC A---LAN
(fa0/0)RouterA(S0/0)
(s0/1)RouterB(fa0/0)
LAN--- PC B


when pc A ping Pc B

Source Mac: PC A
Destination Mac: fa0/0 Router A

Source Mac: fa0/0 Router A
Destination Mac: s0/0 Router A

Source Mac: s0/0 Router A
Destination Mac: s0/1 Router B

Source Mac: s0/1 Router B
Destination Mac: fa0/0 Router B

Source Mac: fa0/0 Router B
Destination Mac: PC B


is this how it goes encapsulating and decapsulationg packets ??

or a Router has just 1 MAC address ??

am i missing something here ?

thx

Re: router MAC 8 years 11 months ago #32512

1) Each interface has a unique layer 2 address. If they are ethernet ports then they will have a unique MAC address per port.

2) The wildcard mask is just a stupid way to express a 'normal' subnet mask. It is a completely pointless way to express an already confusing subject and Cisco should be punished for their inconsistent use of mask type.

In your case, OSPF will advertise the network 192.168.12.64/26 to his friends in Area 0. This means OSPF will tell them that he has a path to any host with an address between 192.168.12.65 - 192.168.12.126. I prefer to just turn on OSPF on the interface itself, that way it automatically grabs the subnet without you need to type it in.

HTH

Re: router MAC 8 years 11 months ago #32521

thx alot man...
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