VLL Service Considerations
Page 144 7750 SR OS Services Guide
The simple three-node network described in Figure 28 shows two MPLS SDPs and one GRE SDP
defined between the nodes. These SDPs connect VPLS1 and VPLS2 instances that are defined in
the three nodes. With this feature the operator will have local CLI based as well as SNMP based
statistics collection for each VC used in the SDPs. This will allow for traffic management of tunnel
usage by the different services and with aggregation the total tunnel usage.
SAP Encapsulations and Pseudowire Types
The 7750 SR Epipe service is designed to carry Ethernet frame payloads, so it can provide
connectivity between any two SAPs that pass Ethernet frames. The following SAP encapsulations
are supported on the 7750 SR Epipe service:
• Ethernet null
• Ethernet dot1q
• SONET/SDH BCP-null
• SONET/SDH BCP-dot1q
• ATM VC with RFC 2684 Ethernet-bridged encapsulation (see Ethernet Interworking VLL
on page 112)
• FR VC with RFC 2427 Ethernet-bridged encapsulation (see Ethernet Interworking VLL
on page 112)
Note that while different encapsulation types can be used, encapsulation mismatching can occur if
the encapsulation behavior is not understood by connecting devices and are unable to send and
receive the expected traffic. For example if the encapsulation type on one side of the Epipe is
dot1q and the other is null, tagged traffic received on the null SAP will be double tagged when it is
transmitted out of the dot1q SAP.
To Next Page
Loading...
