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This module tells you how to use Multilink PPP over serial interface links.
 Note |
As of Cisco IOS XE Software Release 2.1, Multilink PPP over serial interface links is the only Multilink PPP type supported. Multiclass MLPPP is not supported. |
Be familiar with the concepts in the "Reducing Latency and Jitter for Real-Time Traffic Using Multilink PPP" module.
Enable a queueing mechanism such as low latency queueing (LLQ), weighted fair queueing (WFQ), class-based WFQ (CBWFQ) and Weighted Random Early Detection (WRED), as applicable, before configuring multilink.
If a multilink bundle has one link or packet order is not important for interleaved packets, use Link Fragmentation and Interleaving (LFI) without multiclass. Use LFI with multiclass if a multilink bundle has multiple links.
Only Voice over IP (VoIP) is supported.
As of Cisco IOS XE Release 2.1, Multilink PPP over serial interface links is the only Multilink PPP type supported. Multiclass MLPPP is not supported.
Before using Multilink PPP over serial interface links, a traffic policy (policy map) must be created. Policy maps are created using the Modular Quality of Service (QoS) Command-Line Interface (CLI) (MQC).
Before proceeding with this task, you must create a policy map. The policy map contains the configuration parameters used to apply the specific quality of service feature to the network traffic. To create a policy map, use the MQC.
| Command or Action | Purpose | |||
|---|---|---|---|---|
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Step 1 |
enable Example: |
Enables privileged EXEC mode.
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Step 2 |
configure terminal Example: |
Enters global configuration mode. |
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Step 3 |
interface multilink multilink-bundle-number Example: |
Creates a multilink bundle and enters interface configuration mode.
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Step 4 |
ip address ip-address mask [secondary ] Example: |
Sets a primary IP address for an interface. This command can also set the optional secondary IP address for an interface.
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Step 5 |
service-policy output policy-map-name Example: |
Attaches the previously created QoS traffic policy (policy map). The policy map evaluates and applies QoS features for traffic leaving the interface.
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Step 6 |
service-policy input policy-map-name Example: |
Attaches the previously created QoS traffic policy (policy map). The policy map evaluates and applies QoS features for traffic entering the interface.
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Step 7 |
ppp multilink fragment delay milliseconds [microseconds ] Example: |
Specifies a maximum size in units of time for packet fragments on a Multilink PPP (MLP) bundle.
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Step 8 |
ppp multilink interleave Example: |
Enables interleaving of packets among the fragments of larger packets on a multilink bundle. |
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Step 9 |
ppp multilink multiclass Example: |
(Optional) Enables Multiclass Multilink PPP (MCMP) on an interface.
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Step 10 |
end Example: |
(Optional) Exits interface configuration mode. |
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
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Step 2 |
configure terminal Example: |
Enters global configuration mode. |
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Step 3 |
interface serial slot / port : timeslot Example:Example: |
Specifies a serial interface created on a channelized E1 or channelized T1 controller (for ISDN PRI, channel-associated signaling, or robbed-bit signaling), and enters interface configuration mode.
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Step 4 |
no fair-queue Example: |
Disables WFQ (or DWFQ for VIP-enabled routers). |
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Step 5 |
encapsulation ppp Example: |
Sets the serial interface encapsulation method used by the interface. |
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Step 6 |
ppp multilink Example: |
Enables Multilink on an interface. |
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Step 7 |
ppp multilink group group-number Example: |
Restricts a physical link to joining only a designated multilink group interface.
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Step 8 |
end Example: |
(Optional) Exits interface configuration mode. |
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
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Step 2 |
show interfaces [type number ] [first ] [last ] [accounting ] Example: |
(Optional) Displays statistics for all interfaces configured on the router or access server. |
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Step 3 |
show ppp multilink [active | inactive | interface bundle-interface | [username name ] [endpoint endpoint ]] Example: |
(Optional) Displays bundle information for mutlilink bundles. |
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Step 4 |
show policy-map interface interface-name [vc [vpi/ ] vci ] [dlci dlci ] [input | output ] Example: |
(Optional) Displays the packet statistics of all classes that are configured for all service policies either on the specified interface or subinterface or on a specific permanent virtual circuit (PVC) on the interface. |
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Step 5 |
exit Example: |
(Optional) Exits privileged EXEC mode. |
The following is an example of configuring Multilink PPP over serial interface links on a multilink group interface:
Router> enable
Router# configure terminal
Router(config)# interface multilink 1
Router(config-if)# ip address 10.10.100.1 255.255.255.0
Router(config-if)# service-policy output policy1
Router(config-if)# service-policy input policy1
Router(config-if)# ppp multilink fragment delay 20
Router(config-if)# ppp multilink interleave
Router(config-if)# ppp multilink multiclass
Router(config-if)# end
The following is an example of associating the serial interface serial4/1 with the multilink group:
Router> enable
Router# configure terminal
Router(config)# interface serial 4/1:23
Router(config-if)# no fair-queue
Router(config-if)# encapsulation ppp
Router(config-if)# ppp multilink
Router(config-if)# ppp multilink group 1
Router(config-if)# end
You can verify the Multilink PPP over serial interface links configuration by using one or more of the following show commands:
show interfaces
show ppp multilink
show policy-map interface
The following section provides sample output of the showpppmultilink command only. For sample output of the other commands, see the Cisco IOS Quality of Service Solutions Command Reference.
The following is an example of the showpppmultilink command output. In this example, one multilink bundle called bundle-1 is on the system. This bundle has two member links: one active link and one inactive link.
Router# show ppp multilink
Multilink2, bundle name is bundle-1
Endpoint discriminator is bundle-1
Bundle up for 00:00:09, 1/255 load
Receive buffer limit 12000 bytes, frag timeout 1500 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 0 reordered
0/0 discarded fragments/bytes, 0 lost received
0x0 received sequence, 0x3 sent sequence
Member links:1 active, 1 inactive (max not set, min not set)
Se3/2, since 00:00:10, 240 weight, 232 frag size
Se3/3 (inactive)The following sections provide references related to using Multilink PPP over ATM links.
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Related Topic |
Document Title |
|---|---|
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QoS commands: complete command syntax, command modes, command history, defaults, usage guidelines, and examples |
Cisco IOS Quality of Service Solutions Command Reference |
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LLQ, WFQ, CBWFQ, PQ, CQ, FIFO, and other queueing mechanisms |
"Configuring Weighted Fair Queueing" module |
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MQC |
"Applying QoS Features Using the MQC" module |
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Multilink PPP configurations |
"Configuring Media-Independent PPP and Multilink PPP" module |
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Virtual template interfaces |
"Configuring Virtual Template Interfaces" module |
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Multilink PPP overview module |
"Reducing Latency and Jitter for Real-Time Traffic Using Multilink PPP" module |
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Multilink PPP over Frame Relay |
"Using Multilink PPP over Frame Relay" module |
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Multilink PPP over dialer interface links |
"Using Multilink PPP over Dialer Interface Links" module |
|
Multilink PPP over serial interface links |
"Using Multilink PPP over Serial Interface Links" module |
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Standard |
Title |
|---|---|
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No new or modified standards are supported, and support for existing standards has not been modified. |
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MIB |
MIBs Link |
|---|---|
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No new or modified MIBs are supported, and support for existing MIBs has not been modified. |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
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RFC |
Title |
|---|---|
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RFC 1990 |
The PPP Multilink Protocol (MP) |
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RFC 2686 |
Multiclass Extension to Multilink PPP (MCML) |
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Description |
Link |
|---|---|
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.|
Feature Name |
Software Releases |
Feature Configuration Information |
|---|---|---|
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MLPPP QoS (CBWFQ, LLQ, WRED) |
Cisco IOS XE Release 2.1 |
The MLPPP QoS feature implements Multilink PPP (MLPPP) using a distributed hierarchical queueing framework (HQF). The MLPPP QoS feature incorporates class-based weighted fair queueing (CBWFQ), low latency queueing (LLQ), and weighted random early detection (WRED) functionality. |
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