Cisco 3825 - Manual (Page 43)

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Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide
OL-15667-03
Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router
New Features in Cisco IOS Release 12.4(16)MR
UMTS-Iub(ATM0/IMA0.1 - ATM0/IMA.1): Peering Information
UMTS-Iub(ATM0/IMA0.1 - ATM0/IMA.1): Local (192.168.10.2:6666) States:
UMTS-Iub(ATM0/IMA0.1 - ATM0/IMA.1): Connect State: OPEN
UMTS-Iub(ATM0/IMA0.1 - ATM0/IMA.1): Redundancy State: ACTIVE
UMTS-Iub(ATM0/IMA0.1 - ATM0/IMA.1): Version: 4
UMTS-Iub(ATM0/IMA0.1 - ATM0/IMA.1): Remote (192.168.10.1:6666) States:
UMTS-Iub(ATM0/IMA0.1 - ATM0/IMA.1): Version: 4
Note In the previous output, the local shorthaul/interface name appears before the dash (–), and the remote
shorthaul/interface name appears after the dash (–).
4. An admin shutdown of the base ATM interface will shut down all the peering instances, including
the primary peering and all the sub-interface peering(s). (In other words, they will move to the
CLOSED state).
5. An admin shutdown of an ATM sub-interface will shut down only the peering for that
sub-interface. (In other words, the admin shutdown of the ATM sub-interface will make the PVCs
on that sub-interface inactive, but it won’t change the status of the PVCs on the other end of the
shorthaul, Node B or RNC.)
6. When the primary backhaul goes down and the primary peering goes down, the primary peering will
start sending Alarm Indication Signals (AISs) on the shorthaul, and; therefore, bring down the
shorthaul like before. So all shorthaul traffic will stop, including the PVC traffic off-loaded to the
alternate backhaul(s). (In this situation, the sub-interface peering connection state will stay OPEN
as long as the alternate backhaul doesn’t go down).
7. When an alternate or sub-interface backhaul goes down, the sub-interface peering will go down, but
it won’t bring down the shorthaul or start any alarms on the T1/E1 link. So primary backhaul traffic
won’t be affected. (In this case, the sub-interface’s state will not be changed since the sub-interface
is only the logical interface and changing its state will not generate any notification to the Node B
or RNC at the ATM level. If the Node B/RNC wants to be able to detect an alternate backhaul down
situation, configure the OAM-CC on the PVCs that are off-loaded to the alternate/sub-interface
backhaul).
8. Cannot configure the qsaal type PVC under the ATM sub-interface, which means the AAL5 type
traffic cannot be off-loaded to the alternate backhaul unless they are configured as the AAL0 type
on the Cisco 3825 router.
UMTS QoS
Three new commands are added using the Interface Configuration mode for this new feature: umts-iub
set dscp, umts-iub set peering dscp, and gsm-abis set dscp and one new ATM-VC Interface
Configuration command: umts-iub set dscp (see the
“Configuring UMTS QoS” section on page 4-46
and Appendix A, “Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference” ). These new
commands allow you to perform the following:
• UMTS Shorthaul Interface
– Set the default description value to tag the backhaul packet including peering and data generated
from the shorthaul in a UMTS Iub configuration.
– Set the description value in the UMTS Iub configuration such that it overwrites the default value
defined previously. It is also used to tag the peering backhaul packet.