Ericsson SPR1100 Operations Instructions Page 193

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Stream Processing and Networking
- Device redundancy - Standalone 1+1 redundancy, transparent addressing
in redundancy.
Multicast Guard Protocol (MGP) is used as the protection method against duplicate
multicasts in the network. See MGP on page 6-24 for further information.
6.6.2 Ethernet Interfaces
All MPEG over IP interfaces should be fixed to Gigabit line speed and full duplex on
the SPR and the attached IP switch to avoid negotiation (and a potential speed or
duplex change) when on-air.
Interfaces to compression equipment (SPR data interfaces) should be 1000BaseT
copper interfaces.
MTU Ethernet size of 1500 (No jumbo frames).
Active/standby output port configuration is supported and in this case a trunk
connection between main/backup data switches maybe required.
6.6.3 Multicast Routing
Where Multicast Routing is required, switches must support multicast routing (typical
examples are PIM for any source multicast networks, and PIM-SSM for source
specific multicast networks. A local RP can be configured (PIM sparse) if data
switches are not interconnected (loopback interface for each data switch). Anycast
RP can be configured if data switches are interconnected.
Note: There is an advantage on using SSM which is the allocation of less class D
addresses assigned to multicast video traffic.
6.6.4 Forwarding Capacity
MPEG over IP traffic usually runs at a constant bit rate, and buffers in the switch
must be able to cope with the sustained traffic level.
Ethernet switches should be capable of forwarding at line rate on all interfaces
simultaneously. The forwarding capacity should be calculated based on the fact that
Ethernet frames are 1316 bytes length (seven 188 MPEG packets per UDP frame),
i.e. Switch manufacturers often indicate a forwarding capacity based on shorter
Ethernet frame sizes (normally carrying regular TCP data traffic).
6.6.5 IGMP Snooping
Switches must be capable of Internet Group Management Protocol (IGMP) V2
Snooping (filtering by destination address).
2/1553-FGC 101 1400 Uen B
6-23
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