Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

vlans with 2mft-t1 card and frame relay

Hello,

I am currently trying to extend our metro Ethernet with 1841 routers equipped with a 2mft-t1 card 4esw switch card.

I am trying this using point to point frame relay with separate bridge groups for each Vlan.

Currently the config is working but spanning tree is blocking one of my t1 connections.

Please Help!

1 ACCEPTED SOLUTION

Accepted Solutions
Silver

Re: vlans with 2mft-t1 card and frame relay

HI,

But instead you can try out the mfr (multilink FR).

http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a0080087079.html

Hope it helps, rate if does

Krisztian

17 REPLIES
Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

I think it is because of the spanning tree normal behavior. There are two links between the two bridges so one of them has to be blocked in order to keep the loopfree topology.

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Hello,

I believe you are correct I was wondering if any one knew of a workaround. If this was a standard bridge group I believe that I could use circuit groups.

Frame relay does not allow me to apply circuit groups.

Thanks

Silver

Re: vlans with 2mft-t1 card and frame relay

HI,

But instead you can try out the mfr (multilink FR).

http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a0080087079.html

Hope it helps, rate if does

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Hello,

Thanks for the suggestion.

I have already tried this.

I did manage to get it working.

The speed was very slow. I think it would be better if i had tweaked it.

Spanning tree was still blocking the one link. This seemed very strange to me because ppp multilink works fine when configured with bridge groups.

interface MFR1

no ip address

!

interface MFR1.1 point-to-point

ip address 10.102.102.2 255.255.255.0

frame-relay interface-dlci 1000

bridge-group 1

!

interface MFR1.2 point-to-point

ip address 10.103.103.2 255.255.255.0

frame-relay interface-dlci 300

bridge-group 2

interface Serial0/1/0:0

no ip address

ip load-sharing per-packet

encapsulation frame-relay MFR1

no arp frame-relay

!

interface Serial0/1/1:1

no ip address

ip load-sharing per-packet

encapsulation frame-relay MFR1

no arp frame-relay

router2#show spanning-tree summary

Root bridge for: Bridge group 1, Bridge group 2, VLAN300.

PortFast BPDU Guard is disabled

UplinkFast is disabled

BackboneFast is disabled

Name Blocking Listening Learning Forwarding STP Active

-------------------- -------- --------- -------- ---------- ----------

Bridge group 1 2 0 0 1 3

Bridge group 2 0 0 0 2 2

-------------------- -------- --------- -------- ---------- ----------

2 Bridge Groups 2 0 0 3 5

Name Blocking Listening Learning Forwarding STP Active

-------------------- -------- --------- -------- ---------- ----------

VLAN300 0 0 0 1 1

-------------------- -------- --------- -------- ---------- ----------

1 VLAN 0 0 0 1 1

Blocking Listening Learning Forwarding STP Active

-------------------- -------- --------- -------- ---------- ----------

Total 2 0 0 4 6

Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

Why did you configure IP address on MFR interface? It should belong to bridge-group.

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Hello,

I have gone back and retried the mpp frame relay configuration without the ip addresses.

I also made some other changes.

It seems like my spanning tree issue may be ok now but my speed is very slow for the most part but does occasionally burst above 2Mbps.

Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

Let's try to turn off the load-sharing per packet but I think it does affect only the layer3 load balancing. You may try to play with the frame-relay fragment.

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Hello,

I have turned off the per packet load balancing. This did not seem to make a difference.

I cannot find how to change the fragmentation setting.

Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

Try something like this:

interface MFR1.1 point-to-point

frame-relay interface-dlci 1000

class frag

bridge-group 1

!

interface MFR1.2 point-to-point

frame-relay interface-dlci 300

class frag

bridge-group 2

map-class frame-relay frag

frame-relay cir 1536

frame-relay bc 12500

frame-relay be 0

frame-relay mincir 1536

frame-relay fragment 1600

Please note that with these settings both PVCs will get 1536k equally and will be fragmented to 1600 bytes/frame. It will lower serialization delay but obviously you won't have more bandwidth :)

Hope if helps

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Hello,

Thanks for your response.

I tried your suggestion but still have very slow speeds.

If I disconnect one of the t1's I get a consistant ~1.4Mbs.

Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

What does show the: "show frame-relay multilink mfr1 detailed" output?

So it looks as the mfr is not working correctly. What is the IOS release, may be it is wise to look for the IOS bug on Cisco related to mfr.

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Hello

This is the show frame-relay multilink mFR 1 command on both routers. I have tried few versions of ios now. Currnetly I am running 12.4(16)advanced ip the newest one.

I have run a debug and I am getting some errors.

*Jul 5 15:03:12.011: frame_relay_input: F8812000 2B4C5B7, size= 330

*Jul 5 15:03:12.019: frame_relay_input: 48C12000 2B4C4B7, size= 330

*Jul 5 15:03:12.091: MFR1/300: Lost fragment 546 (all links out of sequence)

*Jul 5 15:03:12.491: MFR1/300: Lost fragment 57A (all links out of sequence)

*Jul 5 15:03:12.695: MFR1/300: Lost fragment 594 (all links out of sequence)

The other versions I have tried are

124-6.T7

124-13c

124-11.T2

router1# show frame-relay multilink mfR 1 detailed

Bundle: MFR1, State = up, class = A, fragmentation disabled

BID = first-bundle

No. of bundle links = 2, Peer's bundle-id = first-bundle

Rx buffer size = 24096, Lost frag timeout = 200

Bundle links:

Serial0/1/1:1, HW state = up, link state = Up, LID = Serial0/1/1:1

Cause code = none, Ack timer = 4, Hello timer = 10,

Max retry count = 2, Current count = 0,

Peer LID = Serial0/1/1:1, RTT = 0 ms

Statistics:

Add_link sent = 2, Add_link rcv'd = 1,

Add_link ack sent = 1, Add_link ack rcv'd = 2,

Add_link rej sent = 0, Add_link rej rcv'd = 0,

Remove_link sent = 0, Remove_link rcv'd = 0,

Remove_link_ack sent = 0, Remove_link_ack rcv'd = 0,

Hello sent = 951, Hello rcv'd = 949,

Hello_ack sent = 949, Hello_ack rcv'd = 942,

outgoing pak dropped = 0, incoming pak dropped = 0

Serial0/1/0:0, HW state = up, link state = Up, LID = Serial0/1/0:0

Cause code = none, Ack timer = 4, Hello timer = 10,

Max retry count = 2, Current count = 0,

Peer LID = Serial0/1/0:0, RTT = 0 ms

Statistics:

Add_link sent = 2, Add_link rcv'd = 1,

Add_link ack sent = 1, Add_link ack rcv'd = 2,

Add_link rej sent = 0, Add_link rej rcv'd = 0,

Remove_link sent = 0, Remove_link rcv'd = 0,

Remove_link_ack sent = 0, Remove_link_ack rcv'd = 0,

Hello sent = 946, Hello rcv'd = 1052,

Hello_ack sent = 1052, Hello_ack rcv'd = 946,

outgoing pak dropped = 0, incoming pak dropped = 0

router2#show frame-relay multilink mFR 1 detailed

Bundle: MFR1, State = up, class = A, fragmentation disabled

BID = first-bundle

No. of bundle links = 2, Peer's bundle-id = first-bundle

Rx buffer size = 24096, Lost frag timeout = 200

Bundle links:

Serial0/1/1:1, HW state = up, link state = Up, LID = Serial0/1/1:1

Cause code = none, Ack timer = 4, Hello timer = 10,

Max retry count = 2, Current count = 0,

Peer LID = Serial0/1/1:1, RTT = 0 ms

Statistics:

Add_link sent = 2, Add_link rcv'd = 2,

Add_link ack sent = 2, Add_link ack rcv'd = 1,

Add_link rej sent = 0, Add_link rej rcv'd = 0,

Remove_link sent = 0, Remove_link rcv'd = 0,

Remove_link_ack sent = 0, Remove_link_ack rcv'd = 0,

Hello sent = 892, Hello rcv'd = 893,

Hello_ack sent = 893, Hello_ack rcv'd = 894,

outgoing pak dropped = 0, incoming pak dropped = 0

Serial0/1/0:0, HW state = up, link state = Up, LID = Serial0/1/0:0

Cause code = none, Ack timer = 4, Hello timer = 9,

Max retry count = 3, Current count = 0,

Peer LID = Serial0/1/0:0, RTT = 0 ms

Statistics:

Add_link sent = 2, Add_link rcv'd = 2,

Add_link ack sent = 2, Add_link ack rcv'd = 1,

Add_link rej sent = 0, Add_link rej rcv'd = 0,

Remove_link sent = 0, Remove_link rcv'd = 0,

Remove_link_ack sent = 0, Remove_link_ack rcv'd = 0,

Hello sent = 991, Hello rcv'd = 891,

Hello_ack sent = 891, Hello_ack rcv'd = 991,

outgoing pak dropped = 0, incoming pak dropped = 0

Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

Are the two links from the same provider, because if the delay of the links are different problems can occur?

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Hello,

This is actually a back to back link to extend our metro ethernet service.

Currently the 2 routers are on my desk and have 2 t1 crossovers connected between them.

There should be no difference in delay.

Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

Well it is strange indeed. Does the physical interface show any errors?

Krisztian

New Member

Re: vlans with 2mft-t1 card and frame relay

Thanks

Turns out I didn't have the controller clock set properly. The speed is now fine.

I can now go on with my testing.

Thanks for all of your help it was great.

Silver

Re: vlans with 2mft-t1 card and frame relay

Hi,

It is good news.

Let me know if you have succeeded.

Krisztian

278
Views
0
Helpful
17
Replies