Payload MTU ( IP header + data) excluding any Layer 2 overhead, is PPP MRU derived from the configuration and the PPP MTU.įor a negotiated PPP connection, the INET MTU i.e PPP Negotiation, the server receives the peer MRU value and offers the Same as the PPP MTU and is sent during LCP negotiation. If the MRU is not configured, the PPP MRU remains the On the configured MTU, PPP lower-layer MTU, and the PPP-Max-Payload The PPP MTU value for that subscriber (PPP MTU value derived based If the MRU is configured using the ppp-options option, the PPP MRU is the lesser of the configured MRU value and OS determines the PPP MRU value based on the following: When you configure the MRU for a PPP subscriber for PPPoE Value during link control protocol (LCP) negotiation on point-to-pointĬonnections. Packet to indicate that the router is capable of supporting an MRUīy default, a router uses the PPT MTU value for the PPP MRU Junos OS also returns the PPP-Max-Payload tag in the PADS The PPP MTU is the lesser of the configured MTU and PPP lower-layer Greater than 1492 bytes and also greater than the configured MTU, MTU is the value received in the PPP-Max-Payload tag. Greater than 1492 bytes but less than the configured MTU, the PPP Packet to indicate that the router is not capable of supporting an The PPP-Max-Payload tag in the PPPoE Active Discovery Session (PADS) Less than 1492 bytes, then the PPP MTU is the lesser of the configured If the PPP-Max-Payload tag is present and its value is Packet, then the PPP MTU value is the lesser of the configured MTU If the PPP-Max-Payload tag is not present in the PADR If the PPP lower-layer MTU is greater than 1492 bytes: The PPP-Max-Payload tag is ignored even if it
The PPP MTU value is the lesser of the PPP lower-layer MTU and theĬonfigured MTU value. If the PPP lower-layer MTU falls below 1492 bytes, then Presence and value of the PPP-Max-Payload tag in the PADR packet. Interface based on the configured MTU, PPP lower-layer MTU, and the Junos OS determines the PPP MTU value for a terminated PPPoE – (double-tagged VLANs) – (PPPoE header payload) – 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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