Arista EOS Tunneling (3) - IPinIP

IP-in-IP format:

• Size = 20B, just an ip header, 
• Protocol# = 4

Digram and configuration:

Verification:

R4.cd681#sh ip decap-group
NOTE: "D" column indicates dynamic entries
D | Name         | Type           | Info               | Version | Address Type
--|--------------|----------------|--------------------|---------|-------------
  | ipinip       | IP-in-IP       | 100.20.255.4       | IPv4    |

R4.cd681#show platform trident l3 shadow tunnel encap raw
EGR IP Tunnel:
--------------------------------------------------------------------------------
maxEntries: 512, numEntries: 1
EGR_IP_TUNNEL Address: 0xd72817a4, magic:aeaeaeae, maxEntries: 512, numEntries: 1

EGR_IP_TUNNEL[2]:  0x01  | 0x1 0x0 0x0 0x100000 0x9053fc11 0x9053fc0d 0x1 0x0


R4.cd681#show platform trident l3 shadow tunnel encap
EGR IP Tunnel:
--------------------------------------------------------------------------------
Unit    Id       TnlType       EntType       TTL       DscpSel              SrcIp           DstIp
0        2             0          IPV4        64             1       100.20.255.4    100.20.255.3

R4.cd681#show nexthop-group
ipip
  Id         1
  Type       ipInIp
  Size       1
  TTL        64
  Source IP  100.20.255.4 (Loopback20)
  Entries (left most label is the top of the stack)
    0  100.20.255.3
         Via 100.20.34.3, Ethernet31  (100.20.255.3/32)
         00:1c:73:54:27:cb, Ethernet31