Interface Configuration Guide 7705 SAR Interfaces
Edition: 01 3HE 11011 AAAC TQZZA 95
There is native built-in Ethernet bridging among the ring ports and the v-port.
Bridging destinations for traffic received from one of the ring ports include the 10GigE
ring port and the network interfaces on the v-port. Bridging destinations for traffic
received from the v-port include one or both of the 10GigE ring ports.
With bridging, broadcast and multicast frames are forwarded over all ports except the
received one. Unknown frames are forwarded to both 10GigE ports if received from
the v-port or forwarded to the other 10GigE port only if received from one of the
10GigE ports (the local v-port MAC address is always programmed).
The bridge traffic of the physical 10GigE ports is based on learned and programmed
MAC addresses.
3.2.12 MTU Configuration Guidelines
This section contains information on the following topics:
• MTU Configuration Overview
• IP Fragmentation
• Jumbo Frames
• Default Port MTU Values
3.2.12.1 MTU Configuration Overview
Because of the services overhead (that is, pseudowire/VLL, MPLS tunnel,
dot1q/qinq and dot1p overhead), it is crucial that configurable variable frame size be
supported for end-to-end service delivery.
Observe the following general rules when planning your service and physical
Maximum Transmission Unit (MTU) configurations.
• The 7705 SAR must contend with MTU limitations at many service points. The
physical (access and network) port, service, and SDP MTU values must be
individually defined. Figure 8 identifies the various MTU points on the
7705 SAR.
• The ports that will be designated as network ports intended to carry service
traffic must be identified.
• MTU values should not be modified frequently.
• MTU values must conform to both of the following conditions:
− the service MTU must be less than or equal to the SDP path MTU
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