Before you configure shared interfaces, remember that
on the Root System Domain (RSD), you configure the physical interface
and then configure and assign each logical shared interface under
it to a specific Protected System Domain (PSD).
On the PSD, you configure the physical interface as well and
identify it as a shared interface. Then configure the assigned logical
interfaces under it and bind each one to a peer interface on the Tunnel
PIC owned by the PSD.
When you configure shared interfaces, the values for several
parameters configured on the RSD and the PSD must match:
On the physical SONET interface, Frame Relay encapsulation must be
configured in both the RSD and the PSD. (Point-to-multipoint Frame
Relay is not supported.) Frame Relay encapsulation enables a change
in state to be communicated between the RSD and the PSD. Status is
communicated through Local Management Interface (LMI) packets exchanged
on data-link connection identifier (DLCI) 0. LMI packet exchanges
are managed by the RSD.
On the physical
Gigabit Ethernet interface, VLAN tagging must be configured o in both
the RSD and the PSD.
On the physical SONET interface, the same maximum transmission
unit (MTU) size must be used in both the RSD and PSD. For example,
in both the RSD and PSD, do not include any MTU configuration to allow
the default MTU size to be applied to the physical interface. Or,
in both the RSD and PSD, configure the same MTU size. For example,
in both the RSD and PSD configuration, include the mtu 5000 statement under the [edit so-0/0/1] hierarchy level.
The same
logical unit number must specified on the physical shared interface
(so-fpc/pic/slot.logical unit-number or ge-fpc/pic/slot.logical unit-number) and on the physical
uplink tunnel interface (ut-fpc/pic/slot.logical unit-number) owned by the PSD. For example, in both the RSD and PSD configuration,
specify so-0/0/0.1 as the logical SONET interface. In the
PSD configuration, configure ut-0/0/0.1 as the logical peer
tunnel interface.
On the logical SONET interface, the same data-link connection identifier
(DLCI) must be configured in both the RSD and the PSD. For example,
at the [edit interfaces so-0/0/0.1] hierarchy level, include
the dcli 101 statement in both the RSD configuration and
in the PSD configuration.
On the logical Ethernet interface, the same virtual
LAN (VLAN) identifier must be configured in both the RSD and the PSD.
For example, at the [edit interfaces ge-0/0/0.2] hierarchy
level, include the vlan-id 102 statement in both the RSD
configuration and in the PSD configuration.