[no] channel-group channel-group-id
config>port>tdm>ds1
config>port>tdm>e1
This command creates n ✕ DS0 (64 kb/s) channel groups in a channelized DS1 or E1 circuit. Channel groups cannot be further subdivided.
The no form of this command deletes the specified DS1 or E1 channel group.
n/a
identifies the channel group ID number
crc {16 | 32}
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command configures the precision of the cyclic redundancy check (CRC). Non-ATM channel groups configured under DS1 or E1 support 16-bit checksum. ATM channel groups support a 32-bit checksum.
16
use 16-bit checksum for the associated port/channel
use 32-bit checksum for the associated port/channel
encap-type {atm | cem | ipcp | ppp-auto | frame-relay | cisco-hdlc | hdlc}
no encap-type
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command configures the encapsulation method used for the port on the 16-port T1/E1 ASAP Adapter card, 32-port T1/E1 ASAP Adapter card, 2-port OC3/STM1 Channelized Adapter card, 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card, 4-port DS3/E3 Adapter card (DS3 ports only), or 4-port T1/E1 and RS-232 Combination module (T1/E1 ports only). This parameter can be set on both access and network ports.
For access mode, the supported encapsulation types are atm, cem, frame-relay, cisco-hdlc, hdlc, and ipcp. Table: Adapter Cards and Encapsulation Types in Access Mode lists the adapter cards and the corresponding encapsulation types.
Adapter Card |
Encapsulation Type |
|||||
|---|---|---|---|---|---|---|
atm |
cem |
frame-relay |
cisco-hdlc |
hdlc |
ipcp |
|
16-port T1/E1 ASAP Adapter card |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
32-port T1/E1 ASAP Adapter card |
✓ |
✓ |
✓ |
✓ |
✓ |
✓ |
2-port OC3/STM1 Channelized Adapter card |
✓ |
✓ |
✓ |
|||
4-port OC3/STM1 / 1-port OC12/STM4 Adapter card |
✓ |
|||||
4-port DS3/E3 Adapter card (DS3 ports only) |
✓ |
✓ |
||||
4-port T1/E1 and RS-232 Combination module |
✓ |
✓ |
||||
For network mode, only ppp-auto encapsulation is supported.
To change the encap-type, the channel group must first be deleted, then reconfigured with the new encap-type.
no encap-type
specifies the encapsulation type as ATM for ATM pseudowires
specifies the encapsulation type as circuit emulation mode (CEM) for TDM pseudowires
specifies the encapsulation type as frame relay
specifies the encapsulation type as Cisco HDLC
specifies the encapsulation type as HDLC
specifies the encapsulation type as IPCP for a PPP/MLPPP channel group in access mode on the 2-port OC3/STM1 Channelized Adapter card, 16-port T1/E1 ASAP Adapter card, 32-port T1/E1 ASAP Adapter card, or 4-port T1/E1 and RS-232 Combination module. IPCP is not supported on fractional T1/E1 channels on a 2-port OC3/STM1 Channelized Adapter card.
specifies the encapsulation type as PPP for PPP/MLPPP bundles in network mode
idle-cycle-flag {flags | ones}
no idle-cycle-flag
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command configures the value that the DS0, DS1, DS3, E1, or TDM interface transmits during idle cycles. This command is applicable only if the encapsulation type is ppp-auto.
The no form of this command changes the idle cycle flag to the default value.
flags (0x7E)
use 0x7E as the idle cycle flag
use 0xFF as the idle cycle flag
idle-payload-fill {all-ones | pattern pattern}
no idle-payload-fill
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command defines the data pattern to be transmitted (8-bit value) when the circuit emulation service is not operational or temporarily experiences underrun conditions. This command is only valid for CESoPSN services.
See the 7705 SAR Services Guide for information on CESoPSN services.
all-ones
transmits 11111111
transmits the user-defined pattern
idle-signal-fill {all-ones | pattern pattern}
no idle-signal-fill
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command defines the signaling pattern to be transmitted (4-bit value) when the circuit emulation service is not operational or temporarily experiences underrun conditions. This command is only valid for CES with CAS.
See the 7705 SAR Services Guide for information on CESoPSN services.
all-ones
transmits 1111
transmits the user-defined pattern
loopback {line | internal}
no loopback
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command puts the specified n ✕ DS0 (64 kb/s) channel group in a loopback mode. For T1 ports, the channel group can have 1 to 24 channels. For E1 ports, the channel group can have 1 to 31 channels.
When a line loopback is enabled on the channel group:
frames received on the channel group on the Rx port are looped back toward the Tx (egress) port before reaching the framer. However, if CAS is enabled on the interface, the Tx signaling bits will continue to be sourced from the far end of the Cpipe (not looped back).
an all-ones pattern is inserted by the framer in the direction of the switch fabric and to the far end of the Cpipe
When an internal loopback (usually referred to as an equipment loopback) is enabled on the channel group:
frames received on the channel group from the switch fabric toward the framer are looped back to the switch fabric and to the far end of the Cpipe. However, if CAS is enabled on the interface, the Rx signaling bits will continue to be sourced from the local access port (not looped back).
traffic received on the channel group will continue to be sent out the Tx (egress) port as if no internal loopback was there
N ✕ DS0 (64 kb/s) channel group loopbacks are only supported on the 16-port T1/E1 ASAP Adapter card and the 32-port T1/E1 ASAP Adapter card.
no loopback
puts the specified channel group in line loopback mode
puts the specified channel group in internal loopback mode
mac ieee-address
no mac
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
config>port>tdm>ds3
This command assigns a specific MAC address to an APS port. When the command is issued while the port is operational, IP will issue an ARP, if appropriate, and BPDUs are sent with the new MAC address. Configuring a MAC address using the mac command is only supported for APS channel groups. Physical channel groups do not support the mac command.
The no form of this command removes the configured MAC address. The physical port MAC address will be used instead.
For TDM ports, configuring the MAC address allows the same MAC address to be assigned to ports across two routers in an MC-APS pair for MEF 8.
The mac command is only supported on the 2-port OC3/STM1 Channelized Adapter card and 4-port OC3/STM1 / 1-port OC12/STM4 Adapter card.
no mac
specifies the 48-bit MAC address in the form aa:bb:cc:dd:ee:ff or aa-bb-cc-dd-ee-ff where aa, bb, cc, dd, ee, and ff are hexadecimal numbers. Allowed values are any non-broadcast, non-multicast MAC, and non-IEEE reserved MAC addresses.
mode {access | network}
no mode
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command configures a TDM channel for access or network mode operation.
An access port or channel is used for customer-facing traffic on which services are configured. A Service Access Point (SAP) can only be configured on an access port or channel.
When a port is configured for access mode, the appropriate encap-type must be specified to distinguish the services on the port. Once a TDM channel has been configured for access mode, multiple services can be configured on the TDM channel.
A network port or channel participates in the service provider transport or infrastructure network when a network mode is selected. When the network option is configured, only the ppp-auto encap-type can be configured for the port or channel.
The no form of this command restores the default.
access
configures the port or channel as service access
configures the port or channel for transport network use
mtu mtu-bytes
no mtu
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command configures the maximum payload MTU size for a port.
Packets received that are larger than the MTU will be fragmented or discarded, depending on whether the DF bit is set in the packet header. If the port mode or encapsulation type is changed, the MTU assumes the default values of the new mode or encapsulation type.
The no form of this command restores the default values.
The default MTU value depends on the port type, mode, and encapsulation as listed in the following table.
sets the maximum allowable size of the MTU, expressed as an integer
[no] ppp
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command enables access to the context to configure the LCP operational parameters for a DS1 or E1 channel or a DS0 channel.
The no form of the command removes the LCP operational parameters.
no ppp
ber-sf-link-down
no ber-sf-link-down
config>port>tdm>ds1>channel-group>ppp
config>port>tdm>e1>channel-group>ppp
This command enables the channel-group down on BER-SF alarm. When enabled, the channel-group will be placed out of service once BER-SF is detected.
The no form of this command disables the feature.
no ber-sf-link-down
keepalive time-interval [dropcount drop-count]
no keepalive
config>port>tdm>ds1>channel-group>ppp
config>port>tdm>e1>channel-group>ppp
This command sets the keepalive interval.
The no form of this command returns the interval to the default value.
keepalive 10 dropcount 3
the time in seconds between keepalive messages, expressed as a decimal integer
the number of consecutive keepalive failed request attempts or remote replies that can be missed after which the port is operationally downed
[no] scramble
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command enables payload scrambling on channel groups. The command is applicable only if the encapsulation type is atm.
signal-mode cas
no signal-mode
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command enables or disables Channel Associated Signaling (CAS) at the channel group level. When enabled, control signals (such as those for synchronizing and bounding frames) are carried in the same channels as voice and data signals.
If the signal mode at the DS1/E1 port level is configured for signal-mode cas, any new channel groups default to signal-mode cas. Any existing channel groups can be individually changed from cas to no signal-mode.
The signal mode must be configured for CAS before creating a Cpipe with CAS. Refer to the 7705 SAR Services Guide, ‟Creating a Cpipe Service”, for information on configuring a Cpipe service.
This command is valid only on the following cards and platforms when DS1 framing is set to esf or sf, or E1 framing is set to g704 or no-crc-g704:
16-port T1/E1 ASAP Adapter card
32-port T1/E1 ASAP Adapter card
2-port OC3/STM1 Channelized Adapter card
4-port DS3/E3 Adapter card
7705 SAR-A
7705 SAR-M
7705 SAR-X
specifies channel associated signaling
timeslots timeslots
no timeslots
config>port>tdm>ds1>channel-group
config>port>tdm>e1>channel-group
This command defines the list of DS0 timeslots to be used in the DS1 or E1 channel group. The timeslots do not need to be consecutive. If the encapsulation type is changed to or from atm, the timeslots are reset to the default. If the encapsulation type is set to atm, the timeslot ranges are automatically configured and cannot be changed.
If the port is configured for fractional T1/E1 (see Configuring Fractional T1/E1 Ports for PPP Encapsulation), this command is used to specify the number of timeslots to be used on the port. Only the specified timeslots can be used.
The no form of this command removes DS0 timeslots from a channel group.
no timeslots — non-ATM channel groups
1 to 24 — channel groups configured under DS1 with atm encapsulation
2 to 16, 18 to 32 — channel groups configured under E1 with atm encapsulation
2 to 32 — channel groups configured under E1 (ppp-auto)
specifies the timeslots to be associated with the channel group. The value can consist of a list of timeslots. Each member of the list can either be a single timeslot or a range of timeslots.