I hoping someone can give me some advise. I have a customer who is doing MLPPP on a cisco 1700 this terminates on a cisco 7200 on a CT3 single wide port card doing distributed multilink. The customer was complaining of "sluggish" performance and when i checked the routers for traffic utilization one T1 was hitting the max of 1.4 - 1.5Mb and the other around 900Kb to 1Mb while the multi link interface was around 2.4Mb. I know that multilink load balance will never be a perfect 50/50 but should one link being maxed out while the other is at 900Kb cause any issues?
I also looked at the traffic in a chart format and noticed alot of spikes, probabably due to global sync, whould i enabled WRED, if so do i need to enabled it on the physical interfaces or just on the logical MLPPP interface?
Another thing that I was not sure about is that i currently have fragmentation turned off but i was wondering if its recommend that i turn it on with interleaving? should I also change my MTU to something higher?
I still have to look at the router's logs to see if the problem is due to a physical link bouncing, taking errors, high CPU but any advise is apriciated.
thanks, Paul
1700 config:
interface Multilink1
description Bonded T1 interface.
bandwidth 3072
ip unnumbered Loopback1
ppp multilink
ppp multilink fragment disable
ppp multilink group 1
!
interface FastEthernet0
ip address xxxxx
speed auto
!
interface Serial0
description 2nd t1 - bonded t1
bandwidth 1536
no ip address
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 1
!
interface Serial1
description
bandwidth 1536
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
Multilink1, bundle
Bundle up for 2w1d, total bandwidth 3072, load 9/255
Receive buffer limit 24384 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
925 lost fragments, 23799 reordered
4768/5553936 discarded fragments/bytes, 4768 lost received
0xCF451C received sequence, 0x3509C9 sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Se0, since 2w1d
Se1, since 2w1d
7200:
Multilink1, bundle name is woods-hole-gw
Bundle up for 2w1d
Bundle is Distributed
0 lost fragments, 8526621 reordered, 0 unassigned
0 discarded, 0 lost received, 117/255 load
0x331A58 received sequence, 0xCC9C28 sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Se10/1/0/19:1, since 2w1d, no frags rcvd
Se10/1/0/17:1, since 2w1d, no frags rcvd
I also looked at the traffic in a chart format and noticed alot of spikes, probabably due to global sync, whould i enabled WRED, if so do i need to enabled it on the physical interfaces or just on the logical MLPPP interface?
Another thing that I was not sure about is that i currently have fragmentation turned off but i was wondering if its recommend that i turn it on with interleaving? should I also change my MTU to something higher?
I still have to look at the router's logs to see if the problem is due to a physical link bouncing, taking errors, high CPU but any advise is apriciated.
thanks, Paul
1700 config:
interface Multilink1
description Bonded T1 interface.
bandwidth 3072
ip unnumbered Loopback1
ppp multilink
ppp multilink fragment disable
ppp multilink group 1
!
interface FastEthernet0
ip address xxxxx
speed auto
!
interface Serial0
description 2nd t1 - bonded t1
bandwidth 1536
no ip address
encapsulation ppp
no fair-queue
ppp multilink
ppp multilink group 1
!
interface Serial1
description
bandwidth 1536
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
Multilink1, bundle
Bundle up for 2w1d, total bandwidth 3072, load 9/255
Receive buffer limit 24384 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
925 lost fragments, 23799 reordered
4768/5553936 discarded fragments/bytes, 4768 lost received
0xCF451C received sequence, 0x3509C9 sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Se0, since 2w1d
Se1, since 2w1d
7200:
Multilink1, bundle name is woods-hole-gw
Bundle up for 2w1d
Bundle is Distributed
0 lost fragments, 8526621 reordered, 0 unassigned
0 discarded, 0 lost received, 117/255 load
0x331A58 received sequence, 0xCC9C28 sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Se10/1/0/19:1, since 2w1d, no frags rcvd
Se10/1/0/17:1, since 2w1d, no frags rcvd