Canonical URL: ; File formats: Plain Text PDF; Status: PROPOSED STANDARD; Updated by: RFC ; Authors: D. Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside. If the de-encapsulating router has a route for the un-encapsulated destination address going back to the encapsulating router, you will get a.
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This must be set to 0. There is nothing to say that the two routing tables are in sync.
Retrieved May 14, The Reserved1 field is present only when the Checksum field is present that is, Checksum Present bit is set to one. The tunnel destination is going to the address of the remote router you are terminating the tunnel gde.
If router B does send rrfc back, Router A is supposed to discard them, too, based on the rule. Offset 16 bits The offset field indicates the octet ger from the start of the Routing field to the first octet of the active Source Route Entry to be examined.
Generic Routing Encapsulation
Bits are reserved for future use. Indicates the Key field. Sign up using Email and Password.
Such as allowing multicast traffic to traverse the tunnel providing us scalability with the use of a routing protocol. Cisco’s documentation seems to demostrate that they use this exact behavior to make a keepalive work. Thanks for the answer.
RFC – Generic Routing Encapsulation (GRE)
Information on RFC » RFC Editor
This page was last edited on 28 Novemberat The tunnel source can be a physical interface or an IP address just keep in mind the tunnel source needs to be local on the router.
These bits must be sent as zero and must be ignored on receipt. Sorry, your ge cannot share posts by email. Post was not sent – check your email addresses!