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Configure Multiple Gigabit Fiber Interfaces to Share Bandwidth

I have 2 buildings. In one building I have a cisco 4507 catalyst switch with gigabit fiber ports 4/1 through 4/6. In the other building I have a cisco 3550 switch with gigabit fiber ports 0/1 through 0/12. I have fiber lines between buildings. Right now 4/1 is connected to 0/1. I want to have another connection to share bandwidth. How do I configure the switches to use multiple links to share bandwidth. Example: ports 4/1 and 4/2 on the 4507 connected to 0/1 and 0/2 on the 3550 so that I will have a 2 GB link?

Don Johnston

There is no way to "bond" two gig links to provide 2GB of bandwidth. However, you can create an etherchannel. That way the switches will attempt to distribute the traffic over the two links based on MAC address, IP address or flow (TCP/UDP port numbers).

If the broadcast domain does not extend beyond the building, you could let the route processors distribute the traffic over the two links using equal cost multipath (enabled by default).

crsrvn

ASKER

The 2 buildings are in different subnets. Does this makes the 2 buildings in 2 seperate broadcast domains (correct me if I am wrong). Here is what I currently have linking the 2 buildings.

-Cisco 4507 Switch-

interface GigabitEthernet 5/5
description 4507 to 3550
no switchport
ip address 10.10.10.2 255.255.255.0
ip access-group 1 in
ip access-group 1 out
service-policy output VOICE-POLICY
udld port

#show interface gigabitEthernet 5/5
GigabitEthernet5/5 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet Port, address is 0011.921d.457f (bia 0011.921d.45
7f)
Description: 4507 to 3550
Internet address is 10.10.10.2/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLH
input flow-control is on, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 90000 bits/sec, 47 packets/sec
5 minute output rate 120000 bits/sec, 53 packets/sec
L3 in Switched: ucast: 1687952 pkt, 269551099 bytes - mcast: 0 pkt, 0 bytes
L3 out Switched: ucast: 1991502 pkt, 809965079 bytes - mcast: 0 pkt, 0 bytes
1699901 packets input, 304282138 bytes, 0 no buffer
Received 6590 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 input packets with dribble condition detected
2007207 packets output, 851272567 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

-Cisco 3550 Switch-

interface GigabitEthernet 0/1
description 3550 to 4507
no switchport
ip address 10.10.10.1 255.255.255.0
ip route-cache flow

#show interface gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0011.2155.9280 (bia 0011.2155.9280)
Description: Trunk to MS TC01
Internet address is 10.10.10.1/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is LX
input flow-control is off, output flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:02, output 00:00:02, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 102000 bits/sec, 41 packets/sec
5 minute output rate 68000 bits/sec, 38 packets/sec
642281094 packets input, 3404531759 bytes, 0 no buffer
Received 10819391 broadcasts (0 IP multicast)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 10819332 multicast, 0 pause input
0 input packets with dribble condition detected
2717573669 packets output, 3362189837 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output

crsrvn

ASKER

What can I do to set up a redundant link, or if possible can an etherchannel be made?

ASKER CERTIFIED SOLUTION

Don Johnston

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crsrvn

ASKER

Don,. you are too awesome!

Don Johnston

I have my moments. ;-)