Thursday, June 08, 2006

 

SNAP Encapsulation for ARP. (Problem #69)



Consider the simple network above with the two routers connected to each other over ethernet. After pinging R2 from R1, show arp on the routers shows

R1

R1#show arp
R1#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 12.1.1.1 - aabb.cc00.8300 ARPA Ethernet0
Internet 12.1.1.2 1 aabb.cc00.8400 ARPA Ethernet0

R2

R2#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 12.1.1.1 1 aabb.cc00.8300 ARPA Ethernet0
Internet 12.1.1.2 - aabb.cc00.8400 ARPA Ethernet0

Your task in this problem is to figure out what needs to be done so that the show arp output on both routers changes to

R1

R1#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 12.1.1.1 - aabb.cc00.8300 ARPA Ethernet0
Internet 12.1.1.2 12 aabb.cc00.8400 SNAP Ethernet0

R2

R2#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 12.1.1.1 13 aabb.cc00.8300 SNAP Ethernet0
Internet 12.1.1.2 - aabb.cc00.8400 ARPA Ethernet0

Note that now the "Type" field in the output of show arp indicates SNAP encapsulation for the peer's MAC address.

This page is powered by Blogger. Isn't yours?