Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 454)

430 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
53-1003031-02
MPLS over GRE tunnel
2
LDP over a GRE tunnel within an encrypted network
Figure 52 shows an implementation of LDP/MPLS over GRE over an encrypted network. Traffic is
forced through a non-MPLS network because of the mandatory encrypted network that traffic must
cross.
Customer equipment (CE) is connected to PE1 and PE2. PE1 and PE2 negotiate VPLS labels, and
an LDP tunnel is created between PE1 and PE2. MPLS traffic is not supported between P1 and P2.
LDP transit traffic passes through a GRE tunnel between P1 and P2. Traffic exiting P1 is encrypted
and is sent into the non-MPLS cloud. Traffic received at P2 is already decrypted.
In this scenario, LDP transit over GRE tunnel is configured on the P1 and P2 nodes.
FIGURE 52 LDP over GRE with encryption present in network