Bandle t1 1

[encrb]

The company is expanding the internet from one t1 to 2 t1. (Clear channels)

I have a cisco 2620 with 2 wic-dsu -1t v1 . I am not sure if the default route should be to each serial interface or to the multilink interface.

ip route 0.0.0.0 0.0.0.0 Serial0/0
ip route 0.0.0.0 0.0.0.0 Serial0/1

or

ip route 0.0.0.0 0.0.0.0 Multilink1


Here is my config.

!
interface Multilink1
ip address X.X.X.X 255.255.255.252
no cdp enable
ppp multilink
ppp multilink group 1
!
interface FastEthernet0/0
description Encircle local
ip address X.X.X.X 255.255.255.X
no ip redirects
no ip unreachables
no ip proxy-arp
no ip split-horizon
duplex auto
speed auto
no cdp enable
!
interface FastEthernet0/0.1
no ip redirects
no ip unreachables
no ip proxy-arp
!
interface Serial0/0
description "Multilink First T1"
bandwidth 1536
no ip address
ip verify unicast source reachable-via rx allow-default 100
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting access-violations
encapsulation ppp
no ip mroute-cache
no fair-queue
service-module t1 timeslots 1-24
service-module t1 remote-alarm-enable
no cdp enable
ppp multilink
ppp multilink group 1
!
interface Serial0/1
description "Multilink Second T1"
bandwidth 1536
no ip address
ip verify unicast source reachable-via rx allow-default 100
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting output-packets
ip accounting access-violations
encapsulation ppp
no ip mroute-cache
keepalive 5
no fair-queue
service-module t1 clock source internal
service-module t1 timeslots 1-24
service-module t1 remote-alarm-enable
no cdp enable
ppp multilink
ppp multilink group 1
!
no ip http server
no ip http secure-server
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/0
ip route 0.0.0.0 0.0.0.0 Serial0/1
!
!
logging trap debugging
logging X.X.X.X
access-list 100 permit udp any any eq bootpc
no cdp run
!
!

Any subjection will be appreciated.

Thank you.

 

[Belushi]

The default route to the multilink interface will do instead of the two specifics.

 

[bobbyforhire]

Just got out of this setup (moved over to a 100MB link). Have the route go over the Multilink.

 

[burtsbees]

why not just put in the next hop?

ip route 0.0.0.0 0.0.0.0 next-hop

Burt

 

[maczen]

Hey Burt,
I am somewhat confused now. I have a multilink setup on two interfaces for load balancing.. say S0/0 and S0/1.

Router A
S0/0 192.168.1.1 /31
S0/1 192.168.1.3 /31

On the other end of this WAN link (Frame Relay) is S0/2
Router B
S0/2 192.168.1.0

This will not work, right? Because the S0/1 on Router A is in a different subnet so I would habe to use a /29 and waste three addresses yes?

I apologize but have not played with multilink yet.. Something I plan to remedy as it shows.. LoL

B Haines
CCNA R&S, ETA FOI

 

[Cluebird]

maczen,

That is why the physical hardware interfaces that form the multilink pair have no ip addresses. The ip address goes on the interface multilink. One thing to remember is that multilink doesn't load balance. It is a way to get bigger pipes by glueing together smaller pipes. This is like what a kid does when they get a drink in a restaurant. The drink comes with a straw but the kid wants more beverage so he grabs another straw, sticks that in his drink and sucks through two straws at once. No load balancing.

What does Frame Relay have to do with the ppp multilink? They are two different L2 frames. I can't think of a situation where I'd have Frame Relay on one side and PPP on the other? The only time I've seen them used together is when you're trying to secure the Frame Relay that is running between routers in a WAN. Then you use a virtual-template that has PPP so you can get CHAP.

HTH

 

[maczen]

Gotcha.. Thanks a million Clue!

B Haines
CCNA R&S, ETA FOI

 

[maczen]

Actually, I do have one question.. I canrepost in a new forum if you want but this seems resolved..

What is a virtual-template exactly? I see how to apply it..

"int s0/0

no frame-relay interface-dlci 30

frame-relay interface-dlci 30 ppp virtual-template 1

Apply any LLQ, IP settings, ppp configs under the virtual template interface"
FROM:

http://cciev.wordpress.com/2006/08/30/ppp-virtual-template-and-frame-relay/

But not quite certain what the benefit would be.. Only for CHAP over FR which requires PPP? Also, if I use this Virtual-template with PPP over FR can I use a /31?

Thanks Clue/Guys! Dinner is almost ready or I would try this now!!! LoL

B Haines
CCNA R&S, ETA FOI

 

[burtsbees]

Virtual-templates are also made for ADSL connections (dialer interfaces) and to bundle asynch interfaces. It's just a template (logical) where you can put in certain settings. For example, this is like the multilink---nothing is on the physical interfaces---everything is on the logical multilink interface.

Burt

 

[maczen]

Thanks Burt,
So I am seeing references to applying settings to the logical interface...

1. Apply any LLQ, IP settings, ppp configs under the virtual template interface
2. For example, this is like the multilink---nothing is on the physical interfaces---everything is on the logical multilink interface.

So in the example I provided above:
"int s0/0

no frame-relay interface-dlci 30

frame-relay interface-dlci 30 ppp virtual-template 1"

How would I apply this? Not to s0/0? Sorry for the newbie questions but I love the WAN side!!!


B Haines
CCNA R&S, ETA FOI

 

[burtsbees]

Well, the frame map gets applied to the physical interface in this example, but the ppp encaps (for CHAP) gets applied to the virtual template---this is a special circumstance, since the physical interface is already doing frame encaps---can't have both on a physical interface.

Burt

 

[maczen]

So the IP addressing scheme would be applied to the virtual template?

B Haines
CCNA R&S, ETA FOI

 

[burtsbees]

No---on the interface/subinterface. The VT in this situation is only to provide PPP for CHAP.

Burt

 

[maczen]

Awesome.. Thanks a million Burt!

B Haines
CCNA R&S, ETA FOI