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Chapter 3: System planning
Data network planning
Page 3-52
IP/MPLS priority scheme
IP priority is determined by the DSCP value encoded in the ToS field in IPv4 and Traffic Class in
IPv6. PTP 670 can locate the DSCP value in IP headers encapsulated within VLAN tags and/or
PPP and PPPoE headers. The DSCP field provides 64 levels of priority. PTP 670 selects a
suitable mapping from these DSCP values to the eight PTP 670 queues.
The advantages of IP priority are that priority in the IP header is normally propagated
transparently through a router, also the DSCP field supports a large number of distinct priority
code points. A disadvantage of DSCP is that frames receive a single default classification if they
contain a network layer protocol other than IPv4 or IPv6. This is controlled by the user setting
the Unknown Network Layer Protocol queue value in the same QoS Configuration page under
IP/MPLS QoS.
MPLS priority is encoded in the traffic class (TC) field in the outermost MPLS label. Select a
suitable mapping from MPLS TC to the eight PTP 670 queues.
“Daisy-chaining” PTP 670 links
When connecting two or more PTP 670 links together in a network (daisy-chaining), do not
install direct copper Cat5e connections between the PSUs. Each PSU must be connected to the
network terminating equipment using the LAN port. To daisy-chain PTP 670 links, install each
ODU-to-ODU link using one of the following solutions:
•
A copper Cat5e connection between the Aux ports of two ODUs. For details of the Ethernet
standards supported and maximum permitted cable lengths, see
•
A copper Cat5e connection between the Aux port of one ODU and the SFP port of the next
ODU (using a copper SFP module). For details of the Ethernet standards supported and
maximum permitted cable lengths, see
Ethernet standards and cable lengths
•
Optical connections between the ODUs (SFP ports) using optical SFP modules at each
ODU. For details of the Ethernet standards supported and maximum permitted cable
lengths, see
Green Ethernet switches
Do not connect PTP 670 units to Ethernet networking products that control the level of the
transmitted Ethernet signal based on the measured length of the Ethernet link, for example
Green Ethernet products manufactured by D-Link Corporation. The Ethernet interfaces in these
networking products do not work correctly when connected directly to the PTP 670 PSU.
Содержание PTP 670 Series
Страница 1: ...F Cambium PTP 670 Series User Guide System Release 670 02 50 ...
Страница 349: ...Chapter 5 Installation Installing an SFP Ethernet interface Page 5 52 Correct Incorrect ...
Страница 405: ...Chapter 6 Configuration and alignment System menu Page 6 46 Figure 151 LAN Configuration page PTP topology TDM support ...
Страница 406: ...Chapter 6 Configuration and alignment System menu Page 6 47 Figure 152 LAN Configuration page PTP topology SFP support ...
Страница 408: ...Chapter 6 Configuration and alignment System menu Page 6 49 Figure 154 LAN Configuration page HCMP topology ...
Страница 416: ...Chapter 6 Configuration and alignment System menu Page 6 57 Figure 156 QoS Configuration page IP MPLS ...
Страница 445: ...Chapter 6 Configuration and alignment Management menu Page 6 86 Figure 173 Time Configuration page SNTP enabled ...
Страница 551: ...Chapter 7 Operation System statistics Page 7 64 Figure 250 Main Port Counters page when main port is bridging traffic ...