MTU – [(Ethernet header payload) – (single-tagged VLANs) PPP lower-layer MTU is calculated as: interface ,Ĭonfigured MTU is the MTU value configured using the mtu size statement. ![]() This default behavior can be changed by configuring the mtu ( size| use-lower-layer) and mru size statements at the following hierarchy levels: Tag received in the PPPoE Active Discovery Request (PADR) packet. The PPP MRU value based on the presence and value of the PPP-Max-Payload If the PPP MTU value is greater than 1492 bytes, Junos OS calculates Operational PPP MRU value is also set to the PPP MTU value. MTU (IP header + data) excluding any Layer 2 overhead.īy default, if the PPP MTU value is lower than 1492 bytes, the The terms used in this section are described here: Peer MRUīy the peer to indicate the PPP payload size that it can accept.īy the router to indicate the PPP payload size that it can accept MRU to determine the PPP payload MTU on a negotiated PPP connection. While establishing a PPP connection, PPP end-points negotiate the PPP over Ethernet over ATM (PPPoE over ATM) subscribersĮssentially negotiates between two independent half-duplex links. ![]() The configuration of MRU and MTU is supported for subscribers In the PPPoE Active Discovery Request (PADR) packets. For PPPoE subscribers, the PPP MRU or PPP MTU size canīe greater than 1492 bytes if the PPP-Max-Payload tag is received
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