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standby preempt, minimum, reload, hellotime, holdtime, group-number, delay

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Chapter 4 Configuring the Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line Configuration Sequence • hellotime-Hello interval (in seconds). This is an integer from 1 to 254. The default is 3 seconds. If the msec option is specified, hello interval is in milliseconds. This is an integer from 15 to 999. • holdtime-Time (in seconds) before the active or standby router is declared to be down. This is an integer from x to 255. The default is 10 seconds. If the msec option is specified, holdtime is in milliseconds. This is an integer from y to 3000. Where: - x is the hellotime + 50 milliseconds, then rounded up to the nearest 1 second - y is greater than or equal to 3 times the hellotime and is not less than 50 milliseconds. For example, the following command specifies the hot standby group 1 with the timers set between 1 and 3 seconds: Router(config-if)# standby 1 timers 1 3 Step 14 To configure HSRP preemption and preemption delay, use the standby preempt command in interface configuration mode. To restore the default values, use the no form of this command. Note Without preemption, a standby router will transition to the active state only if HSPR "hello packets" cease. In a RAN-O solution, you may sometimes want a switchover to occur in the absence of a router GE failure; therefore, you need to configure preemption. Router(config-if)# standby [group-number] preempt [delay{minimum delay|reload delay|sync delay}] Where: • group-number-(Optional) Group number on the interface to which the other arguments in this command apply. • delay-(Optional) Required if either the minimum, reload, or sync keywords are specified. • minimum delay-(Optional) Specifies the minimum delay period in delay seconds. The delay argument causes the local router to postpone taking over the active role for delay (minimum) seconds since that router was last restarted. The range is from 0 to 3600 seconds (1 hour). The default is 0 seconds (no delay). • reload delay-(Optional) Specifies the preemption delay period after a reload only. This delay period applies only to the first interface-up event after the router has reloaded. • sync delay-(Optional) Specifies the maximum synchronization period for IP redundancy clients in delay seconds. For example, the following command specifies the hot standby group 1 with preempt: Router(config-if)# standby 1 preempt Note The default group number is 0. The default delay is 0 seconds; if the router wants to preempt, it will do so immediately. By default, the router that comes up later becomes the standby. OL-15667-03 Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide 4-31

Section	Page
Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide	1
Contents	3
Preface	7
Overview of the Cisco 3825 Mobile Wireless Edge Router	11
Introduction	11
RAN-Optimization Implementation	12
Cisco Abis and Iub Optimization over IP Implementation	12
Cisco GSM Abis Optimization over IP	13
Cisco Pseudowire Emulation Edge-to-Edge (PWE3)	14
Cisco Iub Optimization over IP	15
Intelligent Cell Site IP Services	15
Cell Site Points-of-Presence (POPs)	15
Cisco IOS Software Features	16
Software features for the RAN-O Implementation	16
Software Features	17
Redundancy Support	17
HSRP	17
Configuration Statements for CISCO-IP-RAN-BACKHAUL-MIB	18
MIB Support	20
Limitations and Restrictions	21
RAN-O Implementation Limitations and Restrictions	22
Hardware not Supported on the Cisco 3825 Router	22
UMTS Iub and GSM Abis Implementation Limitations and Restrictions	22
Hardware not Supported for UMTS Iub	22
Hardware not Supported for GSM Abis	22
New Features in Cisco IOS Release 12.4(16)MR2	23
Keyword ignore-vpi-vci Added to xconnect Command	23
New Features in Cisco IOS Release 12.4(16)MR1	23
Emulation of TDM Circuit via MPLS/IP (PWE3/TDM)	24
Structure-agnostic TDM over Packet (SAToP)	26
Structure-aware TDM CESoPSN	26
Transportation of ATM Service via MPLS/IP (PWE3/ATM)	27
Transparent Cell Transport Service/ATM Port Mode	27
ATM N-to-One VCC Cell Mode	27
ATM AAL5 CPCS-SDU Mode	28
ATM One-to-One VCC Cell Mode	28
Cell Packing	29
PVC Mapping	29
Transportation of ATM Service via L2TPv3	30
ATM Port Cell Relay Service	30
ATM VCC Cell Relay Service	30
ATM AAL5-SDU Mode	31
Cell Packing	31
PVC Mapping	32
Asymmetric PWE3	32
Ethernet over MPLS	33
VLAN Mode	33
Port Mode	33
PWE3 over MLPPP	34
PWE3 Redundancy	34
TDM PWE3 Redundancy	35
ATM PWE3 Redundancy	35
Ethernet PWE3 Redundancy	35
Maximum Number of Supported ATM Ports	36
ATM Cell Switching	36
New Features in Cisco IOS Release 12.4(16)MR	37
GSMmux-Global System for Mobile Communication (GSM) Abis Optimization over IP	37
UMTSmux-Universal Mobile Telecommunication System (UMTS) Iub Optimization over IP	37
UMTS Congestion Management Control	38
Inverse Multiplexing over ATM (IMA)	39
Permanent Virtual Circuit (PVC) Routing	40
Behavior Changes	42
UMTS QoS	43
Cisco IOS Software Basics	47
Getting Help	47
Understanding Command Modes	48
Undoing a Command or Feature	49
Saving Configuration Changes	49
Where to Go Next	49
First-Time Configuration	51
Understanding Boot Images	51
Understanding the Cisco 3825 Router Interface Numbering	51
Slot and Port Numbering	52
Setup Command Facility	53
Before Starting Your Router	53
Using the Setup Command Facility	54
Configuring Global Parameters	54
Completing the Configuration	57
Configuring the Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line Interface	59
Before You Begin	60
Verifying the Version of Cisco IOS Software	60
Clocking Requirements for Cisco 3825 Router	60
Clock-Related Commands	61
Network-Clock-Participate Command	61
Network-Clock-Select Command	61
Clock Source Command	62
Example Configurations	63
Show Controller Command	63
Configuration Sequence	64
Summary of Steps	64
Configuring the Hostname and Password	64
Verifying the Hostname and Password	65
Configuring Gigabit Ethernet Interfaces	66
Configuring the GE Interface IP Address	66
Setting the Speed and Duplex Mode	66
Enabling the GE Interface	67
Configuring the Backhaul Links	67
Configuring the Card Type for the Cisco 2-port T1/E1-RAN	68
Configuring E1 Controllers	69
Configuring T1 Controllers	70
Configuring Network Clocking Support	72
Configuring Multilink Backhaul Interface	73
Creating a Multilink Bundle	73
Handling PFC and ACFC	74
Configuring PFC	74
Configuring ACFC	75
Enable Multilink and Identify the Multilink Interface	75
Enable Real-Time Transport Protocol (RTP) Header-Compression	76
Configuring the PPP Backhaul Interfaces	77
Extended Availability Drop and Insert (EADI)	78
Configuring GSM-Abis Links	78
Configuring UMTS Links	82
Configuring Redundancy	86
Redundant Cisco 3825 Routers	86
Standalone Cisco 3825 Router	91
Configuring for SNMP Support	91
Configuring Inverse Multiplexing over ATM (IMA)	95
Configuring PVC Routing (HSDPA Offload)	99
Configuring UMTS QoS	104
Creating a Class Map	105
Creating a Policy Map	105
Specify the Location of the Interface	106
Assigning a QoS Boilerplate to an Interface	109
Configuring UMTS Congestion Management Control	113
Configuring Satellite Support	116
Configuring Graceful Degradation	117
Saving Configuration Changes	119
Example Configurations	119
BTS/Node-B Configuration	119
BSC/RNC Configuration	123
Monitoring and Managing the Cisco 3825 Router	127
Enabling the Cisco 3825 Router for Remote Network Management	127
Show Commands for Monitoring the Cisco 3825 Router	129
Where to Go Next	131
Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference	133
Configuration Examples	269
Overview	269
Asymmetric PWE3 Configuration	270
Ethernet over MPLS-VLAN and Port Mode Configuration	283
PWE3 over MLPPP Configuration	289
PWE3 Redundancy Configuration	298
TDM over MPLS Configuration	304
ATM over MPLS Configurations	309
ATM over L2TPv3 Configuration	316
GSM Only Configuration	323
UMTS Only Configuration without IMA	327
Combined GSM and UMTS Configuration	331
GSM and UMTS with IMA Configuration	336
GSM and UMTS with IMA and PVC Routing (HSDPA Offload) Configuration	342
GSM Only Configuration via Satellite	348
GSM Congestion Management	351
UMTS Congestion Management	352

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4-31

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

OL-15667-03

Chapter 4

Configuring the Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line

Configuration Sequence

•

hellotime

—Hello interval (in seconds). This is an integer from 1 to 254. The default is 3 seconds. If

the msec option is specified, hello interval is in milliseconds. This is an integer from 15 to 999.

•

holdtime

—Time (in seconds) before the active or standby router is declared to be down. This is an

integer from x to 255. The default is 10 seconds. If the msec option is specified, holdtime is in

milliseconds. This is an integer from y to 3000.

Where:

–

x is the hellotime + 50 milliseconds, then rounded up to the nearest 1 second

–

y is greater than or equal to 3 times the hellotime and is not less than 50 milliseconds.

For example, the following command specifies the hot standby group 1 with the timers set between 1

and 3 seconds:

Router(config-if)#

standby 1 timers 1 3

Step 14

To configure HSRP preemption and preemption delay, use the

standby preempt

command in interface

configuration mode. To restore the default values, use the

form of this command.

Note

Without preemption, a standby router will transition to the active state only if HSPR “hello

packets” cease. In a RAN-O solution, you may sometimes want a switchover to occur in the

absence of a router GE failure; therefore, you need to configure preemption.

Router(config-if)#

standby

[group-number]

preempt

[

delay

{

minimum

delay

reload

delay

sync

delay

}]

Where:

•

group-number

—(Optional) Group number on the interface to which the other arguments in this

command apply.

•

delay

—(Optional) Required if either the

minimum

reload

, or

sync

keywords are specified.

•

minimum

delay

—(Optional) Specifies the minimum delay period in delay seconds. The delay

argument causes the local router to postpone taking over the active role for delay (minimum)

seconds since that router was last restarted. The range is from 0 to 3600 seconds (1 hour). The

default is 0 seconds (no delay).

•

reload

delay

—(Optional) Specifies the preemption delay period after a reload only. This delay

period applies only to the first interface-up event after the router has reloaded.

•

sync

delay

—(Optional) Specifies the maximum synchronization period for IP redundancy clients in

delay seconds.

For example, the following command specifies the hot standby group 1 with preempt:

Router(config-if)#

standby 1 preempt

Note

The default group number is 0. The default delay is 0 seconds; if the router wants to preempt, it will do

so immediately. By default, the router that comes up later becomes the standby.