This document provides a sample configuration of T1 Unstructured Circuit Emulation Services (CES) using Adaptive clocking. Unstructured service means that the PVCs utilize the entire T1/E1 bandwidth. The ATM switch doesn't look into the T1/E1, but simply reproduces a stream of bits with clocking from the receiving port to the target port. Adaptative clocking means that the CES module infer appropriate timing for data transmission by calculating an average receive data rate. The main advantage of this is that it does not require network clock synchronization. For a more detailed explanation on CES Services please read An Introduction to Circuit Emulation Services.
The sample configurations in this document are based on the following assumptions:
This example uses adaptive clocking mode. Since we are using adaptive clocking, you do not need a network-clock-select statement. However, you may choose to configure the buffer length to prevent buffer overflow and underflow and, at the same time, control delay (greater buffer size means greater delay). The buffer length is proportional to the maximum cell delay variation (CDV), which you can configure with the ces circuit circuit-id [cas] [cdv max-req] command. The default value is 2000 milliseconds. The measured value is displayed in the output of the show ces circuit command.
Framing on both PBXs is Extended Superframe (ESF). This is the default on the LS1010 so it does not need to be explicitly configured. However, we will configure it in this example for the sake of demonstration.
The line-code on both PBXs is binary 8-zero substitution (B8ZS). This is the default on the LS1010 so it does not need to be explicitly configured. However, we will configure it in this example for the sake of demonstration.
The LS1010 is the active side of the soft PVC; the 8540-MSR is the passive side.
The distance between the PBX and the ATM switch is less than 110 feet on the CES PAM. This length is the default line build-out (lbo) so it does not need to be explicitly configured. However, we will configure it in this example for the sake of demonstration.
The LS1010 is equipped with a feature card per-flow queueing (FC-PFQ), which uses a phase lock loop (PLL) capable of locking onto and tracking the selected the clock source. This high quality, locked clock is then fed to the network clock interfaces to provide interface timing. The 8540 MSR is equipped with a Network Clock Module (NetClkMod), which offers the added advantage of a Stratum 3 clock source.
The ATM Pseudo interfaces (ATM-Px/y/z) is created when the circuit is defined. Refer to the document Configuring Circuit Emulation Services for more details.
There are no specific requirements for this document.
This document is not restricted to specific software and hardware versions.
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In this section, you are presented with the information to configure the features described in this document.
This document uses the network setup shown in the diagram below.
This document uses the configurations shown below.
8540-MSR#show running-config Building configuration... Current configuration: ! version 12.0 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption service internal ! hostname 8540-MSR ! boot system flash bootflash:cat8540m-wp-mz.120-1a.W5.7.bin logging buffered 4096 debugging ! redundancy main-cpu no sync config startup sync config running facility-alarm core-temperature major 53 facility-alarm core-temperature minor 45 network-clock-select 1 system ip subnet-zero atm address 47.0091.8100.0000.0090.2144.8401.0090.2144.8401.00 atm router pnni no aesa embedded-number left-justified node 1 level 56 lowest redistribute atm-static ! interface ATM3/0/0 no ip address no ip directed-broadcast ! interface ATM3/0/1 no ip address no ip directed-broadcast ! interface CBR3/1/0 no ip address no ip directed-broadcast ces aal1 clock adaptive ces circuit 0 circuit-name example ces dsx1 linecode b8zs ces dsx1 framing esf ces dsx1 lbo 0_110 ! interface ATM0 no ip address no ip directed-broadcast atm maxvp-number 0 ! interface Ethernet0 no ip directed-broadcast ! line con 0 transport input none line aux 0 line vty 0 4 login ! end
Use show ces address on the passive side of the soft PVC to get the address and VPI/VCI pair that you need to configure the active side of the soft PVC (the LS1010 in this example). See the sample output below:
8540-MSR#show ces address CES-IWF ATM Address(es):47.0091.8100.0000.0090.2144.8401.4000.0c81.9030.10 CBR3/1/0:0 vpi 0 vci 16
ls1010#show running-config Building configuration... Current configuration: ! version 11.3 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption service internal ! hostname ls1010 ! atm address 47.0091.8100.0000.0090.92b8.6401.0090.92b8.6401.00 atm router pnni no aesa embedded-number left-justified node 1 level 56 lowest redistribute atm-static ! no ip address ! interface CBR12/1/0 no ip address ces aal1 clock adaptive ces circuit 0 circuit-name example ces dsx1 linecode b8zs ces dsx1 framing esf ces dsx1 lbo 0_110 ces pvc 0 dest-address 47.0091.8100.0000.0090.2144.8401.4000.0c81.9030.10 vpi 0 vci 16 ! interface CBR12/1/1 no ip address ! interface CBR12/1/2 no ip address ! interface CBR12/1/3 no ip address ! interface ATM13/0/0 no ip address atm maxvp-number 0 ! interface Ethernet13/0/0 ip classless ! line con 0 line aux 0 line vty 0 4 login ! end
Use the show ces interface command to verify that the CES circuits are up on both sides. See the sample output below:
ls1010#show ces interface cbr 12/1/0 Interface: CBR12/1/0 Port-type:T1-DCU IF Status: UP Admin Status: UP Channels in use on this port: 1-24 LineType: ESF LineCoding: B8ZS LoopConfig: NoLoop SignalMode: NoSignalling XmtClockSrc: network-derived DataFormat: UnStructured AAL1 Clocking Mode: Adaptive LineLength: 0_110 LineState: NoAlarm< Errors in the Current Interval: PCVs 514 LCVs 2 ESs 0 SESs 1 SEFSs 0 UASs 0 CSSs 0 LESs 0 BESs 0 DMs 0 Errors in the last 24Hrs: PCVs 2057 LCVs 10 ESs 0 SESs 4 SEFSs 0 UASs 19 CSSs 0 LESs 0 BESs 0 DMs 0 Input Counters: 1054405 cells, 49557035 bytes Output Counters: 1054405 cells, 49557035 bytes
Use the show atm vc command to verify that the soft PVC was established between the two ATM switches. See the sample output below:
8540-MSR#show atm vc interface ATM-P3/1/3 Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status ATM-P3/1/3 0 16 SoftVC ATM3/0/0 0 39 UP LS1010#show atm vc interface ATM-P12/1/3 Interface VPI VCI Type X-Interface X-VPI X-VCI Encap Status ATM-P12/1/3 0 16 SoftVC ATM12/0/0 0 39 UP
Use the show ces circuit cbr x/y/z 0 command to verify that there are no clocking slips and see if the underflows or overflows are increasing. Make sure to use this command on the 8540-MSR side as well. See the sample output below:
ls1010#show ces circuit cbr 12/1/0 0 Circuit: Name sil, Circuit-state ADMIN_UP / Interface CBR12/1/0, Circuit_id 0, Port-Type T1, Port-State UP Port Clocking network-derived, aal1 Clocking Method CESIWF_AAL1_CLOCK_ADAPT Channel in use on this port: 1-24 Channels used by this circuit: 1-24 Cell-Rate: 4107, Bit-Rate 1544000 cas OFF, cell_header 0x100 (vci = 16) Configured CDV 2000 usecs, Measured CDV 373 usecs De-jitter: UnderFlow 1, OverFlow 0 ErrTolerance 8, idleCircuitdetect OFF, onHookIdleCode 0x0 state: VcActive, maxQueueDepth 823, startDequeueDepth 435 Partial Fill: 47, Structured Data Transfer 0 Active SoftVC Src: atm addr 47.0091.8100.0000.0090.92b8.6401.4000.0c86.1030.10 vpi 0, vci 16 Dst: atm addr 47.0091.8100.0000.0090.2144.8401.4000.0c81.9030.10
There is currently no verification procedure available for this configuration.
There is currently no specific troubleshooting information available for this configuration.
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