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Fram Relay hub and spoke scenario

Unanswered Question
Feb 9th, 2006
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See the attachment please

Requirements:

1.Using only physical interfaces configure a Frame Relay hub-and-spoke network between RTA and RTB and RTC, RTB as the hub.


2.Traffic from RTA destined for RTC should transit RTB, and vice versa.


3.Use only the DLCIs specified in the diagram.


4.Do not use any Dynamic layer 3 to layer 2 mappings over these frame Relay connections.


5.Do not send any redundant broadcast traffic from the spokes to the hub.



RTB (Hub):

interface Serial0/0

ip address 3.1.1.2 255.255.255.0

encapsulation frame-relay

frame-relay map ip 3.1.1.1 200 broadcast

frame-relay map ip 3.1.1.3 300 broadcast

no frame-relay inverse-arp



RTA (Spoke):

interface Serial0/0

ip address 3.1.1.1 255.255.255.0

encapsulation frame-relay

frame-relay map ip 3.1.1.2 22 broadcast

frame-relay map ip 3.1.1.3 22

no frame-relay inverse-arp



RTC (Spoke):

interface Serial1/0

ip address 3.1.1.3 255.255.255.0

encapsulation frame-relay

frame-relay map ip 3.1.1.2 33 broadcast

frame-relay map ip 3.1.1.1 33

no frame-relay inverse-arp






My queries:

A- Does he use these two statements because (frame-relay map ip 3.1.1.3 22 and frame-relay map ip 3.1.1.1 33 ) of requirement number 2 ?


B- Doesn’t he use keyword “broadcast” in these two statements (frame-relay map ip 3.1.1.3 22 and frame-relay map ip 3.1.1.1 33) because of requirement 5?


C- Does that mean if requirement 5 is not there we should have used “broadcast“ keyword ?


D- Does not that contradict with what Cisco syas: “The broadcast keyword is commonly used with the frame relay map command” ?


E- By using these two statements (frame-relay map ip 3.1.1.3 22 and frame-relay map ip 3.1.1.1 33) doesn’t my network become full mesh? but if you look to the diagram it is partial mesh ?




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pkhatri Thu, 02/09/2006 - 21:13
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Answers to your queries:


A. Correct

B. Correct

C. That depends. In most cases, it is a good idea to have broadcasts on, especially when using routing protocols like OSPF which send traffic to multicast destinations. I would habe it on most times.

D. The recommendation from Cisco is not contradictory. The lab scenario is making you do something quite specific so you have to follow that. You don't always have to follow requirements in order to make things work.

E. No. Full-mesh refers to a full mesh of PVCs. If there was a PVC from A to C it would be full mesh.


Hope that helps - pls rate the post if it does.


Paresh

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