- Written by Sudheer Y R
- Posted on October 9, 2018
- Updated on July 16, 2025
- 28350 Views
This feature introduces the hardware forwarding support for IPv4 over IPv4, GRE-Tunnel interfaces on Arista Switches. A GRE-Tunnel interface acts as a logical interface which performs the GRE encapsulation or decapsulation. IPv6 payload over IPv4 GRE-Tunnel interfaces is supported with limitations (see Limitation section).
- Written by Binoshmon T B
- Posted on July 22, 2020
- Updated on March 16, 2026
- 19183 Views
The TCP MSS clamping feature involves clamping the maximum segment size (MSS) in the TCP header of TCP SYN packets if it exceeds the configured MSS ceiling limit for the interface. Clamping MSS value helps in avoiding IP fragmentation in tunnel scenarios by ensuring that MSS is small enough to accommodate the extra overhead of GRE and tunnel outer IP headers. One of the most common use cases for this feature is connectivity towards Cloud providers via GRE which require asymmetric routing (for example DDoS protection).
- Written by Martin Stigge
- Posted on October 22, 2018
- Updated on March 20, 2026
- 15923 Views
RSVP-TE applies the Resource Reservation Protocol (RSVP) for Traffic Engineering (TE), i.e., to distribute MPLS labels for steering traffic and reserving bandwidth.