As is well known, multi
ethernet interfaces could bind to a Eth-Trunk to increase the bandwith and redundancy.
Is there any similar logical interfaces for the serial interfaces and POS
interfaces?
Actually, there indeed are such logical interfaces, it’s called MP(MultiLink PPP).
Multilink PPP (MP) is a technique that binds multiple PPP links together to increase bandwidth and ensure link reliability.
To create a MP-Group interface, let’s take the picture above as an example:
1. Create a MP-Group on the router, and configure the IP address on the MP-Group interface view:
[ar1]int mp-group 0/0/0
[ar1-Mp-group0/0/0]ip add 10.1.1.1 24
2. Adjust the link portocol to PPP, and bind the serial interface into the MP-Group logical interface:
[ar1]interface Serial3/0/0
[ar1-Serial3/0/0]link-protocol ppp
[ar1-Serial3/0/0]ppp mp Mp-group 0/0/1
As the picture below shows, after the configuring on both router, the ping result is normal.
But what if we bind the POS interface and serial interface into the same MP-Group interface as the picture shows, will it work?
Configure these two interfaces into the same MP-Group logical interface, the configuration as the picture below shows, and no error occurred during the configuring.
The result of the ping as picture below shows.
As the picture shows, the ping result is normal.
Will this happen due to all the traffic is forwarded on the same link?
Capture packets on both POS link and serial link
On POS link, the packets capturing result as the picture below shows.
On serial link, the packets capturing result as the picture below shows.
From the result, we could learn that the traffic is load-balanced on the two links, which means the MP-Group could bind serial interface and POS interface together simultaneously.
This could work, I think, is due to both the encapsulation mode for POS interface and serial interface are PPP, and the MP technique considers the encapsulation type, rather than the physical link.
That’s all for this post. If you have any questions, please comment below.
Thanks.
