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1 ip Bundle or 1 Bundle per slot ?

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sonny
1 ip Bundle or 1 Bundle per slot ?

Dear all

i have a question about the UBR10000 config

should i use 1 ip Bundle on all slot , or 8 ip Bundle for 8 slot ?

when i think 1 Bundle for all slot , it easy to control ip scope and save the ip usage.
but only 1 bundle will have any effect about the traffic ? more broadcast ? more arp packet ?
because only 1 ip bundle will have a large broadcast domain on 1 cmts .

have any doc or suggestion?

thanks , and sorry about my poor english .

Sonny

kolszak
In fact, ip bundle have

In fact, ip bundle have multiple VRF or sub-interface's etc. Only traffic from provisioning was big broadcast domain, but cable modem not generate strange traffic. I'm not use UBR, but C4 and one biggest problem to bundle master to first card is when this card has broken..... All network have problem and if You replaced broken card, all configuration probably must be retype or unbound (I'm not remember details from arris documentation).

wwt
In fact, ip bundle have

in conf of C4 for example

configure interface cable-mac 1 cable bundle master
configure interface cable-mac 2 cable bundle cable-mac 1
configure interface cable-mac 3 cable bundle cable-mac 1

configure interface cable-downstream 14/0 cable cable-mac 2
configure interface cable-downstream 14/1 cable cable-mac 2
configure interface cable-downstream 14/2 cable cable-mac 2
configure interface cable-downstream 14/3 cable cable-mac 2
configure interface cable-upstream 1/0 cable cable-mac 2
configure interface cable-upstream 1/1 cable cable-mac 2
configure interface cable-upstream 1/2 cable cable-mac 2
configure interface cable-downstream 15/0 cable cable-mac 3
configure interface cable-downstream 15/1 cable cable-mac 3
configure interface cable-downstream 15/2 cable cable-mac 3
configure interface cable-downstream 15/3 cable cable-mac 3
configure interface cable-upstream 2/0 cable cable-mac 3
configure interface cable-upstream 2/1 cable cable-mac 3
configure interface cable-upstream 2/2 cable cable-mac 3

on cable-mac 1 you have only IP subinterface and you don't connect upstream or downstream
up/downstrem you connect to cable-mac2 or 3

if one card has broken only one location have problem not all network :D
best regards/sorry for my English

mbowe
There are big pros for

There are big pros for running a bundle, and I guess some small cons.

Much more efficient to have one IP pool for all the modems/CPE to share. Easier to configure, and much less IP wastage.

Downside I guess is you end up with more ARP traffic - but I can't remember anyone ever complaining that their cable network wasn't working due to too much ARP.

I only have experience with small to mid-sized ubr10k though, never worked on a fully populated one.

sonny
thanks kolszak and mbowe.

thanks kolszak and mbowe.

agree with your reply.
but i don't have see any document talk about this.
so i can't expect the amount of the arp traffic.

maybe will increase the delay ?
if use cable arp filter to limit it , maybe will loss arp ?

this is what i want find out .

kolszak
Don't afraid about ARP :).

Don't afraid about ARP :). CPE client don't need all ARP from broadcast domain only router. If your client must be communitate with other CPE from this same broadcast network enable proxy arp on your CMTS. In fact we have disable this option's about five years and nobody call to us. Arris C4 have arp protothrottle options to set time of arp query. Maybe check tcpdump and arp traffic when connect CPE to modem on cable network. I'm have one bundle and this is my arp table not so big :)

karol@MSI:~$ arp -a
r.28.2.1.cable.sta.petrus.com.pl (78.28.2.1) at 00:01:5c:32:57:41 [ether] on eth0

sonny
i have do a little test .

i have do a little test .

i using Wireshark to monitor the packet after cable modem .
I have receiver the arp request packet from cmts .
cmts have ask the ip that on ip bundle.
so if the ip bundle have a large ip scope , maybe will get more arp request from cmts.

that is what i am afraid.