You can configure the maximum transmission unit (MTU)
and maximum receive unit for Point-to-Point Protocol (PPP) subscribers.
This configuration is supported for the following PPP subscribers:
PPP over Ethernet (PPPoE) subscribers
PPP over Ethernet over ATM (PPPoE over ATM) subscribers
PPP over ATM (PPPoA) subscribers
Tunneled PPP LAC subscribers
Tunneled PPP LNS subscribers
The MTU configuration specifies the maximum allowable data unit
size (in bytes) that can be transmitted over a PPP connection without
fragmentation. This size excludes the lower-layer header size. With
this configuration, you can choose to either configure an explicit
MTU value or use the MTU value configured for the interface excluding
the lower-layer header size.
The MRU configuration specifies the size of maximum receive
unit (MRU) that the router uses during link control protocol (LCP)
negotiation for dynamic and static PPP subscribers and L2TP tunneled
subscribers.
To configure MTU and MRU values for PPP subscribers:
- (Optional) Configure the MTU and the MRU for dynamic
PPP subscribers (includes dynamic PPPoE and PPPoE over ATM subscribers).
[edit dynamic-profiles profile-name interfaces "$junos-interface-ifd-name" unit “$junos-interface-unit” ppp-options],
mru size;
user@host# mtu (size | use-lower-layer);
- (Optional) Configure the MTU and the MRU for static PPP
subscribers (includes PPP over ATM subscribers).
[edit interfaces pp0 unit unit-number ppp-options]
mru size;
user@host# mtu (size | use-lower-layer);
- (Optional) Configure the MTU and the MRU for dynamic tunneled
PPP subscribers for L2TP LNS.
[edit dynamic-profiles profile-name interfaces "$junos-interface-ifd-name" unit “$junos-interface-unit” ppp-options],
mru size;
user@host# mtu (size | use-lower-layer);
- (Optional) Configure the MTU and the MRU for static tunneled
PPP subscribers for L2TP LNS.
[edit interfaces si interface-id unit unit-number ppp-options]
mru size;
user@host# mtu (size | use-lower-layer);
- Configure the MTU and the MRU for static and dynamic PPP
subscribers associated with a group profile.
[edit access group-profile group-profile-name ppp ppp-options]
mru size;
user@host# mtu (size | use-lower-layer);
