established. Traffic is then allowed to flow locally between two VLANs if both are explicitly allowed
inter-VLAN communication.
How to establish the VLAN interfaces and also allow local inter VLAN communication between VLAN
and VLAN:
# eth vlan –allow 15
# eth vlan –allow 16
Then, find the automatically assigned interface IDs for the VLAN interfaces:
# eth show
VLAN Configurations
VLAN Id IF Index Inter VLAN Comm
15 11 Allow
16 12 Allow
Now give each of the VLAN interfaces an IP address and an IP subnet. The interface IP address must be
reachable through the SatLink network so that the GRE tunnel packets from the other side of each GRE
tunnel reach the respective VLAN interface!
# ip set 11 10.10.21.1 255.255.255.0
# ip set 12 10.10.22.1 255.255.255.0
Finally, associate a GRE tunnel to each of the VLAN interfaces. This causes the IP address of the
respective VLAN interface to be set as the tunnel source IP address of the respective GRE tunnel.
#ip gre add 192.168.1.0 255.255.255.0 10.20.1.1 11
#ip gre add 192.168.2.0 255.255.255.0 10.20.1.2 12
#ip gre show
GRE Tunnel Interfaces:
----------------------
If Tunnel Local Address Tunnel Remote Address
4 10.10.21.1 10.10.20.1
5 10.10.22.1 10.10.20.2
It is assumed that the other endpoint of each of the GRE tunnels maps back to the respective VLAN
interface IP addresses as the tunnel destination. The address spaces of the two GRE tunnels are
independent, as they connect to different VLANs and they may be overlapping.
18.6 Ethernet User Priority (802.1p/D)
IEEE Std 802.1Q defines an Ethernet frame format that can be used to carry user priority across a LAN.
IEEE Std 802.1p/D describes how user priority can be used to control queuing delay in an Ethernet MAC
bridge. In a similar way, the VSAT can control queuing delay before transmission to the satellite, based
on the user priority tag values and the chosen mapping to QoS groups. When the VSAT is licensed to
support VLAN extension, the VSAT is also capable of mapping user priority tag values to QoS groups.
However, the interface must be in VLAN trunk mode to receive user priority, as described in section 18.5.
By default, the user priority does not affect the choice of QoS group and the packets are subject to
inspection by the MFC. As required, the VSAT can be configured to map a specific user priority tag
value to a specific QoS group. This effectively bypasses the IP header inspection, classification and
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