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Frame relay

Hello,

I saw this configuration on cisco web site, and no expalin about "frame-relay map ip 172.16.123.1 102 broadcast",, dose this make ping itself?

interface Serial0/0.1 multipoint

ip address 172.16.123.1 255.255.255.0

ip pim dense-mode

ip ospf message-digest-key 1 md5 nmc

ip ospf network point-to-multipoint

frame-relay map ip 172.16.123.1 102 broadcast

frame-relay map ip 172.16.123.2 102 broadcast

frame-relay map ip 172.16.123.3 103 broadcast

no frame-relay inverse-arp

thanks

1 REPLY
VIP Purple

Re: Frame relay

Hello,

the statement is necessary in order to be able to ping the local interface, Serial0/0.1 in this case, with IP address 172.16.123.1. This is the way Non-Broadcast Multiaccess media such as physical or multipoint Frame Relay works, you need a mapping for each IP address. The ping actually traverses the link and then comes back. If you have a chance, you can test this and try to ping the local interface without the frame-relay map statement, which will not work.

The 'broadcast' keyword at the end of the 'frame-relay map' statement is not necessary, since there is already a 'broadcast' added to the same DLCI in the next statement. It is actually not only unnecessary, but it will waste bandwidth, because it will cause the router to send redundant broadcast and/or multicast out the circuit.

HTH,

GP

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