Arista EOS Tunneling (1)

Arista EOS Tunneling is a little different from other vendors' implmentations

• Encap and decap are separated, which are defined in nexthop-group and decap-group. 
• On 1 router configure nexthop-group and on other router only has decap group. 
• For example, you can have internet traffic to FW, which tunnels the packets to severs. And servers directly route the returning traffic to users. 
• nexthop-group does NOT equal to tunnel interface. It is not an interface, actually it is encap endpoint. 
• Starting from 4.21.1F, EOS support hw GRE tunnel interface. Only on Jericho platforms - 7020R, 7280R, 7500R. 

Tunneling vs platforms(chipset) and releases. 

• Sand platform - Arad/Jericho/J+/Qurman
• GRE encap + decap
• IPinIP decap only
• Strata platform - Trident 2/Thomahawk
• IPinIP encap + decap

In this quick lab, we will configure the GRE and IPinIP tunnels in the following topology:

• Use ONE router - RtrAB to simulate end hosts by dividing into VRFs.
• 222.10.10.1 -- 222.10.20.1 over GRE tunnel
• 222.20.10.1 -- 222.20.20.1 over IPinIP tunnel