342-86400-498PS
Issue 1.2
April 2012
Page 166
Copyright
GE Multilin Inc. 2010-2012
Ensure that the SONET bandwidth assigned to each TDM pipe is larger than the
sum of peak traffic throughputs for individual applications carried in the given
TDM pipe.
(If external switches are used to combine different applications, note that a
paddleboard port can belong to only one D-PVLAN, so all QVLANs accessing
ETHER-1000 system through the same paddleboard port will be on the same
TDM pipe.)
Pros: Provides guaranteed SONET bandwidth to lower priority
applications.
Cons: Individual applications are provided with less spare bandwidth than
in Approach 2a. Increased traffic needs are not as easy to handle
as in Approach 2a. Flooding of the GMII port (e.g. due to a
broadcast storm) is a potential issue; Approach 2c reduces the
impact of such event.
Approach 2c
Use either Approach 2a or 2b but also rate limit each port's unicast, multicast and
broadcast traffic to 800 Mb/s or 80% of respective TDM pipe's capacity,
whichever is smaller. (For 10/100 Mb/s ports this may be n/a.)
Pros: Rate limiting ensures that any traffic flooding occurring on one of
the access ports would have limited effect on other access ports.
Cons: GigE port rates are limited even under normal conditions (unless
unicast traffic is not rate limited).
