Configuring Ports
Page 214 7750 SR OS Interface Configuration Guide
• The published switchover times for bundle protection groups on the router are dependent
on the far end being able to recover from cell loss within that time. To ensure this, the
following recommendations are given:
→ The BPGrp link activation timer should be configured to a value small enough to
allow a quick recovery from any IMA failure occurring during the switchover. A
recommended value is 1 second.
→ The ADM that terminates APS should support standard APS switchover time
requirements.
→ The far end IMA/MLPPP links must be able to tolerate cell loss during APS
switchover without bringing links down. This includes, for example, a combination of
link activation/deactivation and appropriate configuration of TDM/SONET debounce
timers.
→ Because of the temporary cell loss during the APS switchover, the far end IMA/
MLPPP will experience a misalignment between individual links within an IMA/
MLPPP group. The far end IMA/MLPPP group must support fast-realignment of links
without having to bring the links down. The router synchronizes the IMA/MLPPP
streams the far end receives between switchovers in an effort to cause the least amount
of misalignment.
→ To increase the BPGrp robustness, it is recommended to provision more IMA/MLPPP
links than is required and set the minimum links and max bandwidth parameters to the
number of required links. This type of configuration is required on the far end as well.
Configuring a Channelized DS1 Card
7750 SR-c12 and 7750 SR-c4 support channelized DS-1 cards. The channelization is as follows:
• N*DS0 in DS1 port.{1..24}
• N*DS0 in E1 port.{1..32}
To make sure you have a channel-capable MDA or CMA, verify the MDA-type you are
configuring by entering a show mda slot-id command.
In the following example, MDA 7 shows a channelized DS1 CMA.
A:7710-3>config# show mda
===============================================================================
MDA Summary
===============================================================================
Slot Mda Provisioned Equipped Admin Operational
Mda-type Mda-type State State
-------------------------------------------------------------------------------
1 1 m60-10/100eth-tx m60-10/100eth-tx up up
3 m4-atmoc12/3-sfp m4-atmoc12/3-sfp up up
5 c8-10/100eth-tx c8-10/100eth-tx up up
6 c1-1gb-sfp c1-1gb-sfp up up
7 c8-chds1 c8-chds1 up up
8 c4-ds3 c4-ds3 up up
===============================================================================
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