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bandwidth utilisation

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jyotish

jyotish

MIS
May 7, 2003
4
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0
MY
Our organisation have 2x2Mbps leased line coming into a Cisco2600 Router. Even though my ISP tells me that my avaliable output is 4Mbps , I feel that at any one time I only have 2Mbps available and the traffic is load-balanced. Is there anything I can do on the router side in terms of configuration to make the 2 leased line behave like one 4Mbps line.

Thank You
 
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How are the leased lines setup? Please show your config.
 
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--------------------------------------------------------------------------------

FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 0006.281f.0360 (bia 0006.281f.0360)
Internet address is
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 3/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 2716 drops
5 minute input rate 331000 bits/sec, 182 packets/sec
5 minute output rate 1443000 bits/sec, 225 packets/sec
125230444 packets input, 877263947 bytes
Received 21527 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
130230574 packets output, 3518780877 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 206555 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Serial0/0 is up, line protocol is up
Hardware is PowerQUICC Serial
Internet address is
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 21/255, rxload 133/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 244
Queueing strategy: weighted fair
Output queue: 0/1000/64/190 (size/max total/threshold/drops)
Conversations 0/91/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 806000 bits/sec, 124 packets/sec
5 minute output rate 128000 bits/sec, 95 packets/sec
54488067 packets input, 3203515492 bytes, 0 no buffer
Received 127796 broadcasts, 0 runts, 0 giants, 0 throttles
3520 input errors, 935 CRC, 1298 frame, 0 overrun, 0 ignored, 1287 abort
54958825 packets output, 2523003492 bytes, 0 underruns
0 output errors, 0 collisions, 20 interface resets
0 output buffer failures, 0 output buffers swapped out
8 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

Serial0/1 is up, line protocol is up
Hardware is PowerQUICC Serial
Internet address is
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 30/255, rxload 100/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 37099
Queueing strategy: weighted fair
Output queue: 0/1000/64/37053 (size/max total/threshold/drops)
Conversations 0/257/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 608000 bits/sec, 103 packets/sec
5 minute output rate 183000 bits/sec, 95 packets/sec
54957920 packets input, 3577666821 bytes, 0 no buffer
Received 127797 broadcasts, 0 runts, 0 giants, 0 throttles
7 input errors, 2 CRC, 4 frame, 0 overrun, 0 ignored, 1 abort
54973317 packets output, 2719987620 bytes, 0 underruns
0 output errors, 0 collisions, 13 interface resets
0 output buffer failures, 0 output buffers swapped out
6 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
 
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AN update to my query ...this is my router config------------------------------------------------------------------------------

FastEthernet0/0 is up, line protocol is up
Hardware is AmdFE, address is 0006.281f.0360 (bia 0006.281f.0360)
Internet address is
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 3/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 2716 drops
5 minute input rate 331000 bits/sec, 182 packets/sec
5 minute output rate 1443000 bits/sec, 225 packets/sec
125230444 packets input, 877263947 bytes
Received 21527 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
130230574 packets output, 3518780877 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 206555 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
Serial0/0 is up, line protocol is up
Hardware is PowerQUICC Serial
Internet address is
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 21/255, rxload 133/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 244
Queueing strategy: weighted fair
Output queue: 0/1000/64/190 (size/max total/threshold/drops)
Conversations 0/91/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 806000 bits/sec, 124 packets/sec
5 minute output rate 128000 bits/sec, 95 packets/sec
54488067 packets input, 3203515492 bytes, 0 no buffer
Received 127796 broadcasts, 0 runts, 0 giants, 0 throttles
3520 input errors, 935 CRC, 1298 frame, 0 overrun, 0 ignored, 1287 abort
54958825 packets output, 2523003492 bytes, 0 underruns
0 output errors, 0 collisions, 20 interface resets
0 output buffer failures, 0 output buffers swapped out
8 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up

Serial0/1 is up, line protocol is up
Hardware is PowerQUICC Serial
Internet address is
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 30/255, rxload 100/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0 (size/max/drops); Total output drops: 37099
Queueing strategy: weighted fair
Output queue: 0/1000/64/37053 (size/max total/threshold/drops)
Conversations 0/257/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 608000 bits/sec, 103 packets/sec
5 minute output rate 183000 bits/sec, 95 packets/sec
54957920 packets input, 3577666821 bytes, 0 no buffer
Received 127797 broadcasts, 0 runts, 0 giants, 0 throttles
7 input errors, 2 CRC, 4 frame, 0 overrun, 0 ignored, 1 abort
54973317 packets output, 2719987620 bytes, 0 underruns
0 output errors, 0 collisions, 13 interface resets
0 output buffer failures, 0 output buffers swapped out
6 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
 
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my sh run config

Building configuration...

Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname router
!

!
!
!
!
!
ip subnet-zero
ip name-server 192.228.128.18
ip name-server 192.228.128.20
ip name-server 202.188.0.133
ip name-server 202.188.1.5
!
!
!
!
interface FastEthernet0/0
ip address
no ip directed-broadcast
duplex auto
speed auto
!
interface Serial0/0
ip address
no ip directed-broadcast
no ip mroute-cache
ignore-dcd
!
interface Serial0/1
ip address
no ip directed-broadcast
!
!
ip classless
ip route 0.0.0.0 0.0.0.0 219.
ip route 0.0.0.0 0.0.0.0 219.
!
!
line con 0
transport input none
line aux 0
line vty 0 4
login
!
end
 
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If your ISP allows it, configure PPP-Multilink.

Orlando Palomar Jr
CCIE# 11206, CCNP
CIPT Operations Specialist
Phil-Data Business Systems, Inc.
 
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The load sharing you have is per session as the serial interfaces have route-caching enabled, you can see this by `show ip interface s0/0'

The sh interface you posted indicates that both links are passing traffic (txload 30/255,txload 21/255) so you should get more than the 2Mbps you are seeing.

If you turn that off then you will see the links perform per packet load sharing. But as always there is a downside, having the route-cache enabled uses the routers fast switching path, diasabling this causes each packet to be process switched by the CPU. Although you will get per packet load sharing, the performance may be drastically reduced, depending on router spec and traffic load.

You could try using IP CEF, this again depends on the router spec.

Another alternative:

Int lo0 10.255.255.1 255.255.255.255

int s0/0
ip unnumbered lo0
no ip route-cache

int s0/1
ip unnumbered lo0
no ip route-cache

ip route 0.0.0.0 0.0.0.0 rem-ip-loopback

This would need configuring at both ends of the link.



 
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You can do load balancing per packet with ip cef route cache turned on.

configure terminal
ip cef
interface fastethernet0/0
ip load-sharing per-packet
 
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