Multilink PPP over two T1's

[jresnickehrlich]

We are switching to multilink ppp, bundling (aggregating?) two T1 lines (serial interfaces on a 3725 router). I think I understand a basic multilink ppp config, but not how to apply in / out traffic ACLs. Sample multilink ppp configs I've come across don't show how/where ACLs get applied, except one IOS Config doc about multilink PPP and QoS explains using class-map and policy-map commands and I see we can apply ACLs that way. Is that what we should do?

(We currently apply the ACLs to each serial interface using the access-group command -- the T1's are not bundled -- and the serials use HDLC and cef)

Thanks for any help.

[pkhatri]

Hi,

When using multilink PPP, the IP interface is the actual multilink interface. Therefore, you should apply all ACLs or QoS policies to the multilink interface.

Hope that helps - pls do rate the post if it does.

Paresh

[jresnickehrlich]

Thanks. Do I simply apply the same command access-group (i.e. access-group 101 in) on the IP interface just like we have now on the serials? Not sure, as the doc "Using Multilink PPP over Serial Interfaces" --

http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_chapter09186a00804a40f9.html#wp1064854

-- says I am *required* to use the class-map and policy-map commands, as in:

class-map match-any traffic-in

match access-group name incoming

policy-map in

class traffic-in

class-map match-any traffic-out

match access-group name outgoing

policy-map out

class traffic-out

on the IP interface:

service-policy output out

service-policy input in

[JOHN VOLTER]

jresnickehrlich - to simply answer your question - no, you do not have to use it to make mu1 interface work.

[Wilson Samuel]

Hi,

Whenever you configure MultiLink, then the multilink interface becomes the L-3 interface for all the member L-1/L-2 Interfaces e.g. even the IP Addresses are configured on the Multilink Interfaces hence all other L-3 configurations ie ACLs etc.

Kind Regards,

Wilson Samuel

PS: Please rate, if it helps