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Use the Cisco 10000 Edge Services Router (ESR) Multilink Point-to-Point Protocol (MLP) feature to bundle T1 interfaces into logical groups. This chapter provides the procedure for creating MLP bundles. For information on unsupported MLP commands, see the online Cisco 10000 ESR Troubleshooting Guide.
Figure 8-1 illustrates a multilink bundle consisting of T1 interfaces from three T3 interfaces.
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Tips You can use MLP to create a degree of redundancy by configuring a multilink bundle made up of T1 lines from more than one line card. If one line card stops operating, the part of the bundle on other line cards continues to operate. |
This section explains how to create a new multilink group in which multiple T1 interfaces can be bundled. You can create up to 512 multilink groups on each Cisco 10000 ESR.
Router(config)# interface multilink 8 Router(config-if)#
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Note You also use the interface multilink number command to enter interface configuration mode for an already existing multilink group. |
Step 2 Use the ppp chap hostname command to assign a name that is used when you add T1 interfaces to the group. For example:
Router(config-if)# ppp chap hostname cambridge
Step 3 To create an IP address for the multilink group, use the ip address command. For example:
Router(config-if)# ip address 172.27.48.209 255.255.0.0
Step 4 Add any other configuration subcommands required for the enabling of routing protocols and adjust the interface characteristics.
Step 5 Exit out of interface configuration mode.
Router(config-if)# exit Router(config)#
After creating the multilink group, you can assign T1 interfaces to it.
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Note Multilink fragmentation is not supported on the Cisco 10000 ESR. You must disable fragmentation on the remote end of the connection. |
This section tells you how to add T1 interfaces to a multilink group. A multilink group consisting of multiple T1 interfaces is referred to as a multilink bundle.
You should assign only full T1 interfaces to a multilink group. You cannot assign more than ten T1 interfaces to a multilink group.
Router(config)# interface serial 3/0/0/1:0
Step 2 If you have not already done so, specify the interface encapsulation as PPP.
Router(config-if)# encapsulation ppp
Step 3 Enter the ppp multilink command to enable this interface to support MLP.
Router(config-if)# ppp multilink
Step 4 Assign this interface to the multilink group. In this example, the interface is assigned to multilink group 8.
Router(config-if)# multilink-group 8
Step 5 Specify the PPP CHAP hostname. The hostname should be the same as the one assigned when you created the multilink group in the "Creating a New Multilink Group" section.
Router(config-if)# ppp chap hostname cambridge
Step 6 Exit out of interface configuration mode.
Router(config-if)# exit Router(config)#
If the interface you added to the multilink bundle contains information such as an IP address, routing protocol, or access list, the router ignores that information. If you remove the interface from the multilink bundle, that information becomes active again.
To add more T1 interfaces to an already created multilink bundle, repeat Step 1 through Step 6.
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Tips To move a T1 line to a different MLP bundle, follow the above procedure. Be sure to change the multilink-group number in Step 4 and the hostname value in Step 5. |
To remove an interface from a multilink bundle, use the procedure described in this section.
Router(config)# interface serial 3/0/0/1:0
Step 2 Remove the interface from the multilink group.
Router(config-if)# no multilink-group
Step 3 Disable multilink for the interface.
Router(config-if)# no ppp multilink
Step 4 Remove the PPP authentication.
Router(config-if)# no ppp chap hostname
Step 5 Exit out of interface configuration mode.
Router(config-if)# exit Router(config)#
After you remove PPP authentication, the interface is completely removed from the multilink bundle.
This section lists show commands you can use to obtain information about multilink bundles.
Use the show interfaces multilink command to obtain statistics on a multilink bundle.
Example:
Router# show interfaces multilink 8
Multilink8 is up, line protocol is up
Hardware is multilink group interface
Internet address is 100.1.1.1/24
MTU 1500 bytes, BW 15360 Kbit, DLY 100000 usec, rely 255/255, load
1/255
Encapsulation PPP, crc 16, loopback not set
Keepalive not set
DTR is pulsed for 2 seconds on reset
LCP Open, multilink Open
Open:IPCP
Last input 15:24:43, output never, output hang never
Last clearing of "show interface" counters 15:27:59
Queueing strategy:fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
36 packets input, 665 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
31 packets output, 774 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Use the show ppp multilink command to obtain information about all existing multilink bundles and their member links.
Example:
Router# show ppp multilink
Multilink8, bundle name is group1
Bundle is Distributed
0 lost fragments, 0 reordered, 0 unassigned, sequence 0x0/0x9
rcvd/sent
8 discarded, 4 lost received, 1/255 load
Member links:10 active, 0 inactive (max 10, min not set)
Serial3/0/0/1:0
Serial3/0/0/2:0
Serial3/0/0/3:0
Serial3/0/0/4:0
...
Use the show interfaces multilink group-number stat command to review traffic statistics for a multilink bundle.
Example:
Router# show interfaces multilink 8 stat
Multilink 8
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 36 665 31 774
Route cache 0 0 0 0
Total 36 665 31 774
Posted: Tue Oct 3 09:46:00 PDT 2000
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