Typical Configuration Of IMA on AR28、AR46 Series Routers

Typical Configuration Of IMA on AR28、AR46 Series Routers

[Requirements]

RTA is bound to an IMA-group through two lines, and interworks with RTB through the ATM network. RTB is also bound to an IMA-group through two lines.

[Networking diagram]

[Configuration script]

Configuration script (RTA)

# sysname RTA # interface Atm1/0 ima ima-group 1                /Add the ATM1/0 interface to IMA-group 1/ # interface Atm1/1 ima ima-group 1                /Add the ATM1/1 interface to IMA-group 1/ # interface Atm1/2 # interface Atm1/3 # interface Ima-group1/1 pvc to-rtb 5/32                        /Set ATM PVC to 5/32/ map ip 10.1.1.2 broadcast              /Mapping of the peer address/ ip address 10.1.1.1 255.255.255.252    /Local IP address/ #

Configuration script (RTB)

#    sysname RTB # interface Atm1/0 ima ima-group 1                /Add the ATM1/0 interface to IMA-group 1/ # interface Atm1/1  ima ima-group 1                 /Add the ATM1/1 interface to IMA-group 1/ #   interface Atm1/2  #      interface Atm1/3 # interface Ima-group1/1  pvc to-rta 5/207                      /Set ATM PVC to 5/207/   map ip 10.1.1.1 broadcast            /Mapping of the peer address/   ip address 10.1.1.2 255.255.255.252   /Local IP address/ #

 

[Verification]

Using the display atm pvc-info interface Ima-group 1/1 command on RTA, you can see that the PVC of IMA-group interface is up, and the peer is reachable by using the ping command.

[Quidway]display atm pvc-info interface Ima-group 1/1

VPI/VCI|STATE|PVC-NAME        |INDEX|ENCAP|PROT   |INTERFACE

-------|-----|----------------|-----|-----|-------|---------------------

  5/32 |UP    |    to-rtb      |0    |SNAP |IP     |Ima-group1/1 (UP)

[Quidway] ping 10.1.1.2

  PING 10.1.1.2: 56  data bytes, press CTRL_C to break

    Reply from 10.1.1.2: bytes=56 Sequence=1 ttl=255 time=1 ms

    Reply from 10.1.1.2: bytes=56 Sequence=2 ttl=255 time=1 ms

    Reply from 10.1.1.2: bytes=56 Sequence=3 ttl=255 time=1 ms

    Reply from 10.1.1.2: bytes=56 Sequence=4 ttl=255 time=1 ms

    Reply from 10.1.1.2: bytes=56 Sequence=5 ttl=255 time=1 ms

 

  --- 10.1.1.2 ping statistics ---

    5 packet(s) transmitted

    5 packet(s) received

    0.00% packet loss

    round-trip min/avg/max = 1/1/1 ms

 [Tip]

1. Inverse Multiplexing for ATM (IMA) is a technology that apportions the cell flow from the ATM layer to multiple E1/T1 links in a certain sequence in the send direction, and then restores the cell flow by demultiplexing at the receive end. These physical links compose one IMA logical link (IMA-group), and its rate is close to the rate sum of all the physical links in the group.

2. To use IMA in China, you must use the IMA-E1 module.

3. There are two kinds of IMA-E1 modules: 75 ohm (BNC coaxial cable) and 120 ohm (shielded twisted pairs) for different lines.

4. Default parameters of the IMA interface:

Parameter	Optional parameter (default value)	Setting command
Clock	Master, slave (slave)	clock master, clock slave
Frame format	CRC4, no-CRC4 (CRC4)	frame-format crc4-adm, frame-format no-crc4-adm
Scramble	Enabled, disabled (enabled)	Scramble, undo scramble
Line CODEC format	AMI, HDB3 (HDB3)	code { ami | hdb3 }

 

To connect a line, make sure that parameters on the router are the same as those of the line; otherwise, the line cannot be up, or there are a lot of errors on the port after the line is up, resulting in failure to ping the peer.