08-05-2009 12:33 AM - edited 03-04-2019 05:39 AM
hello
According to RFC2390: " Upon receiving an InARP request, a station may put the requester's protocol address/hardware address mapping into its ARP cache as it would any ARP request."
If i have R1,R2,R3 with R1 as the hub, and i will configure:
- on R2 static mapping to R3
- on R3 static mapping to R2
- on R1 inverse arp
R1 after receiving LMI will send inverse arp request to R2 and R3 which will respond to this packet. The question is: will R2 and R3 add dynamic mapping for that DLCI/IP received in this inverse-arp request ?
Thanx
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08-05-2009 02:25 AM
Hello,
On Cisco routers, they will. The Cisco routers learn also by receiving requests, not just by receiving replies.
However, this is an implementation dependent behavior, I believe. The RFC clearly does not require that FR DTE devices learn InverseARP mappings also by requests. I can imagine a more naive (or perhaps, more strict) implementation that learns only using replies.
Best regards,
Peter
08-05-2009 02:25 AM
Hello,
On Cisco routers, they will. The Cisco routers learn also by receiving requests, not just by receiving replies.
However, this is an implementation dependent behavior, I believe. The RFC clearly does not require that FR DTE devices learn InverseARP mappings also by requests. I can imagine a more naive (or perhaps, more strict) implementation that learns only using replies.
Best regards,
Peter
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