Interface Naming

[bfrericks]

Sorry for this simple question,

I have a couple 2-pot WIC cards. They showup as serial0/0/0:0. They are in a 2811 router. Two questions:

1. What does each position in the 0/0/0:0 symbolize? I recall that it used to be slot#/port# but that is only two positions.

2. What would the correct setup for channel-groups be for each interface? I am implementing MLPPP for 3 links. Should I configure each port on the 2-port wics and channel group 0 or 0 and 1 respectivly? Basically should they showup as serial0/0/0:0 and serial0/0/0:1 or serial0/0/0:0 and serial0/0/1:0? Basically looking for best practices. I am not channelizing, they will all be using all 24.

Thanks in advnace!

Blake

[royalblues · Accepted solution]

Hi Blake,

The postions indicate module/slot/port number

These were the naming conventiones which were used for routers having VIP cards(slot/port adapter/port) installed and i think cisco has incorporated the same on the ISR routers

Regarding your second question

Whenever you configure a channel group a corredponding interface will be created say for eg. serial0/0/0:0.

The first 3 digits correspond to the Controller port (in above case e1 0/0/0)and the one after the colon is the channel group number.

If you create channel-group 1 the corresponding interface which would be created is serial0/0/0:1

THe Number of channel groups that can be created also varies with the platform and the type of interface card.

Since you will be using all the 24 channels,

the best configuration would be create a single channel group 0 for all the 3 links and bundle.

sample configuration

Controller e1 0/0/0

channel-group 0 timeslots 1-24

Controller e1 0/1/0

channel-group 0 timeslots 1-24

Controller e1 0/2/0

channel-group 0 timeslots 1-24

interface multilink 1

ip address x.x.x.x y.y.y.y

ppp multilink

ppp multilink group 1

interface serial 0/0/0:0

no ip address

encap ppp

ppp multilink

ppp multilink group 1

interface serial 0/1/0:0

no ip address

encap ppp

ppp multilink

ppp multilink group 1

interface serial 0/2/0:0

no ip address

encap ppp

ppp multilink

ppp multilink group 1

HTH, rate if it does

Narayan

[amit-singh · Accepted solution]

Blake

1. Serial 0/0/0:0 signifies the module/slot/port number on the 2811 router. Please check the link below for better understanding of the interface naming on ISR routers:

http://www.cisco.com/en/US/products/hw/routers/ps282/products_tech_note09186a008035b051.shtml

2. It really doesnot matter the way interfaces appear in a multiplink configuration. The most important is that you should have the same multilink group configured under all the interfaces.

HTH,Please rate if it does.

-amit singh