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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?
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crsrvn
Asked:
crsrvn
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1 Solution
 
Don JohnstonInstructorCommented:
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).
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crsrvnAuthor Commented:
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
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crsrvnAuthor Commented:
What can I do to set up a redundant link, or if possible can an etherchannel be made?
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Don JohnstonInstructorCommented:
You've got two options:

1) Bring up the second link just like the existing link(different IP addresses, obviously. i.e. 10.10.11.0/24). Both switches will do CEF and will balance the traffic across both links.

2) Create a layer 3 etherchannel. The 3550 will only be able to distribute the traffic based on source or destination MAC address.

CEF will give you much better load distribution so I would go with option 1.
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crsrvnAuthor Commented:
Don,. you are too awesome!
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Don JohnstonInstructorCommented:
I have my moments. ;-)
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