Prerequisites For Frame Relay Dlci-To-Atm Aal5Snap Bridged Interworking - Cisco ASR1002 - ASR 1002 Router Software Configuration Manual
Asr 1000 series aggregation services routers
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Prerequisites for Frame Relay DLCI-to-ATM AAL5SNAP Bridged Interworking
Table 1
AC Type
ATM
Gigabit Ethernet
POS
Fast Ethernet
1. The MTU configured on an AC must not exceed the MTU in the core network. This ensures that the traffic is not fragmented.
•
Prerequisites for Frame Relay DLCI-to-ATM AAL5SNAP Bridged
Interworking
Before you configure the Frame Relay Data Link Connection Identifier (DLCI)-to-ATM AAL5SNAP
Bridged Interworking feature on a router, ensure that the following prerequisites are met:
•
•
Frame Relay DLCI-to-ATM AAL5SNAP Bridged Interworking
This feature provides interoperability between the ATM attachment VC and Frame Relay attachment VC
connected to different PE routers. This interworking uses the bridged encapsulation corresponding to the
bridged (Ethernet) interworking mechanism. The Ethernet frames are carried through the MPLS network
using Ethernet over MPLS (EoMPLS). This feature is configured only in the bridged mode and not in
the routed mode.
Figure 1
attachment VC and the Frame Relay attachment VC.
Figure 1
ATM CE
Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
4
Range of MTUs for Different ACs
The CE routers with Ethernet attachment VCs running OSPF must be configured with the ospfIfType
option so that the OSPF protocol treats the underlying physical broadcast link as a P2P link.
Enable frame-relay switching on the Frame Relay provider edge (PE) router.
Customer edge (CE) routers must support Bridge-group Virtual Interface or Routed Bridge
Encapsulation.
shows the interworking function performed in the PE routers that are connected to the ATM
Network Topology for Frame Relay DLCI-to-ATM AAL5SNAP Bridged Interworking
VPI/VCI
ATM Link
ATM PE
Range of MTUs
64 to 9216
1500 to 9216
64 to 9216
1500 to 9216
Pseudowire using EoMPLS
Pseudowire using EoMPLS
Pseudowire using EoMPLS
Tunnel LSP
P Router
P Router
MPLS Network
Configuring MPLS Layer 2 VPNs
1
Supported
DLCI
Frame Relay
Link
FR PE
FR CE
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