06-11-2009 07:15 AM - edited 03-04-2019 05:05 AM
I'm trying to develop a good template for bonding T1s together using MLPPP.
So the member serial interfaces need to have WFQ disabled or keep it enabled? Should CEF be disabled on the multilink interface or should it be left enabled? I'm trying to figure out how multilink load balances traffic across the member links and if any of the queueing or route switching upsets that.
It should be noted that we are using CBWFQ on the multilink interface with class-maps that use NBAR. Below is a sample of what we're working with today:
interface Multilink26
description Multilink interface
ip unnumbered Loopback0
ip verify unicast reverse-path
no ip redirects
ip nbar protocol-discovery
no ip route-cache cef
ppp multilink
ppp multilink group 26
no cdp enable
service-policy output VoIP-qos
!
interface Serial1/0/24:0
description Member link
bandwidth 1544
ip unnumbered Loopback0
ip verify unicast reverse-path
no ip redirects
no ip proxy-arp
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 26
!
interface Serial1/0/25:0
description Member link
bandwidth 1544
ip unnumbered Loopback0
ip verify unicast reverse-path
no ip redirects
no ip proxy-arp
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 26
Any ideas on what we should be doing differently. This is from a 7206VXR with PA-MC-2T3-EC cards and the other side is a non-cisco device.
06-11-2009 09:45 AM
Here is an example of a config we use on a 2811. This seems to work well:
interface Multilink1
bandwidth 3000
ip address x.x.x.x 255.255.255.252
ip mtu 1496
ip tcp adjust-mss 1400
no peer neighbor-route
no cdp enable
ppp chap hostname xxx
ppp multilink
ppp multilink fragment disable
ppp multilink links minimum 1
ppp multilink group 1
service-policy output qos_queue
interface Serial0/2/0:0
bandwidth 1536
no ip address
encapsulation ppp
no keepalive
no fair-queue
ppp chap hostname xxx
ppp multilink
ppp multilink group 1
!
interface Serial0/2/1:0
bandwidth 1536
no ip address
encapsulation ppp
no keepalive
no fair-queue
ppp chap hostname xxx
ppp multilink
ppp multilink group 1
06-11-2009 11:09 AM
What's the reason for "no fair-queue" on the serial interface.
06-11-2009 11:25 AM
I believe IOS puts it on by default on higher bandwidth links. I don't believe it is necessary.
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