Nortel Networks 8000 - Manual (Page 298)

8 Frame relay configuration
Nortel Secure Router 8000 Series
Configuration -WAN Access
transmitted over the master PVCs. After the switching, however, the traffic transmits over the
slave PVCs.
You can configure several standby groups on a router.
m
NOTE
The SR8000 implements the IP Tunnel as a standby link to back up FR over IP. A PVC and IP Tunnel
standby link can exist in one standby group at the same time. Figure 8-2 shows an example for switching
PVC with IP Tunnel.
Precautions
When applying the switching PVC of FR, note the following:
- You must configure the switching PVC standby groups on the DCE instead of on the
DTE.
- The switching takes place within the standby group. Nortel recommends for you to
configure the slave PVCs and switching conditions with caution.
- You must manually enable the switching from the slave PVCs to the master PVCs.
8.1.3 Frame relay compression
You can use the FR compression technique to compress FR packets to save network
bandwidth, reduce network load and improve the data transmission efficiency on the FR
network.
The system supports FRF.9 (FRF.9 stac compression) function.
FRF.9 classifies packets into the following:
• You use control packets for status negotiation between the two ends of DLCI after you
configure the compression protocol. The FRF.9 data packets exchange only after the
negotiation succeeds. If the FRF9 control packets are sent more than certain times and
the negotiation cannot succeed, the negotiation stops and compression configuration
does not take effect.
• Data packet
FRF.9 only compresses data packets and inverse ARP packets, excluding LMI packets.
8.1.4 multilink frame relay
You provide Multilink frame relay (MFR) as a cost-effective bandwidth solution FR users.
Based on the FRF. 16 protocol of FR forum, it realizes MFR function on the UNI/NNI
interface.
The MFR feature provides the MFR interface, a type of logical interface, to bind from
multiple FR physical links. The MFR interface supports high-speed and broad-bandwidth
links on the FR network.
To maximize the bandwidth of bundled interfaces, bundle physical interfaces of the same rate
for the same MFR interface after configuring the MFR interface. This can reduce
management cost.
Bundle and bundle link
Bundle and bundle link are two basic concepts related to MFR.
8-8 Nortel Networks Inc. Issue 5.3 (30 March 2009)