Cisco CCNP and CCIE Study Notes

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.