Juniper JUNOSE SOFTWARE FOR E SERIES 11.0.X - BGP AND MPLS CONFIGURATION GUIDE 2009-12-30 Configuration Manual page 587

10G LMs, ES2 10G Uplink LMs, and ES2 10G ADV LMs. At point B, the MPLS
encapsulation header is added to the packet and the egress line module forwards it
to the MPLS network. This functionality is the same for both ES2 4G, ES2 10G, ES2
10G Uplink, and ES2 10G ADV LMs. When the packet reaches the subinterface on
the ingress line module (ES2 4G LM and ES2 10G LM), point C, inside PE2, the added
MPLS header is removed and the packet is sent to the subinterface on the egress line
module, point D, for further processing. At point D, for ES2 4G LMs, the packet is
sent to the remote CE-facing device, depending on the configuration of the S-VLAN
subinterface. If the packet arrives with a single or no tag, the router adds the S-VLAN
tag and sends it to the CE-facing device. On ES2 10G LMs, ES2 10G Uplink LMs, and
ES2 10G ADV LMs, at point D, the packet is forwarded to the CE-facing device without
any modification.
In the same scenario, when Ethernet raw mode is enabled on the S-VLAN subinterface
of the PE devices, the processing of Ethernet packets is performed in a slightly
different way. At the S-VLAN subinterface on an ingress ES2 4G LM, ES2 10G LM,
ES2 10G Uplink LM, and ES2 10G ADV LM, point A, inside PE1, the S-VLAN tag is
removed from the received packet before being forwarded to the subinterface on
the egress line module, B, inside PE1. At point B, the MPLS encapsulation header is
added to the packet and the egress line module forwards it to the MPLS network.
This functionality is the same for both ES2 4G LMs ,ES2 10G LMs, ES2 10G Uplink
LMs, and ES2 10G ADV LMs. When the packet reaches the subinterface on the ingress
ES2 4G LMs, ES2 10G LMs, ES2 10G Uplink LMs, and ES2 10G ADV LMs, point C,
inside PE2, the added MPLS header is removed and the packet is sent to the
subinterface on the egress line module, point D, for further processing. This behavior
is the same, regardless of whether raw mode encapsulation is enabled or not. At
point D, for both ES2 4G LMs, ES2 10G LMs, ES2 10G Uplink LMs, and ES2 10G ADV
LMs, the S-VLAN tag is inserted into the packet and sent to the CE-facing device at
the remote site.
Related Topics
S-VLAN Subinterface with an Untagged C-VLAN ID Examples
Consider the following example in which an S-VLAN interface is configured with an
S-VLAN ID of 4 and the C-VLAN tag as any. Only packets that are double tagged,
which contain both the S-VLAN and C-VLAN tags, are matched for this S-VLAN
subinterface. Packets that are only S-VLAN tagged and do not contain a C-VLAN tag
are not matched for the S-VLAN subinterface.
route interface
mpls-relay
Ethernet Raw Mode Encapsulation for Martini Layer 2 Transport Overview on
page 516
host1(config)#interface fastEthernet 2/0
host1(config-if)#encapsulation vlan
host1(config-if)#interface fastEthernet 2/0.1
host1(config-if)#svlan id 4 any
S-VLAN Subinterface with an Untagged C-VLAN ID Examples
Chapter 7: Configuring Layer 2 Services over MPLS
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