Lab - EIGRP Load Balancing
EIGRP Load Balancing
Topology
Objectives:
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Review a basic EIGRP configuration
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Explore the EIGRP topology table
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Identify successors, feasible successors, and feasible distances.
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Use show and debug commands for the EIGRP topology table
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Configure and verify equal-cost loading with EIGRP
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Configure and verify unequal-cost load balancing with EIGRP
Step 1: Configure the addressing and serial links.
所有的链路带宽设为 64kbps
Step 2: Configure EIGRP.
Router eigrp 100
Network 10.0.0.0
Debug ip eigrp 100
0 SM 40512000 - 40000000 512000
*Jul 23 09:20:50.263: IP-EIGRP(Default-IP-Routing-Table:100): route installed for 10.1.102.0 ()
*Jul 23 09:20:50.263: IP-EIGRP(Default-IP-Routing-Table:100): Int 10.1.2.0/30 M 40640000 - 40000000 640000 SM 128256 - 256 128000
*Jul 23 09:20:50.267: IP-EIGRP(Default-IP-Routing-Table:100): route installed for 10.1.2.0 ()
*Jul 23 09:20:50.267: IP-EIGRP(Default-IP-Routing-Table:100): Int 10.1.2.4/30 M 40640000 - 40000000 640000 SM 128256 - 256 128000
*Jul 23 09:20:50.271: IP-EIGRP(Default-IP-Routing-Table:100): route installed for 10.1.2.4 ()
*Jul 23 09:20:50.271: IP-EIGRP(Default-IP-Routing-Table:100): Int 10.1.2.8/30 M 40640000 - 40000000 640000 SM 128256 - 256 128000
*Jul 23 09:20:50.275: IP-EIGRP(Default-IP-Routing-Table:100): route installed for 10.1.2.8 ()
R3#show ip route | b Ga
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 12 subnets, 2 masks
C 10.1.3.8/30 is directly connected, Loopback39
D 10.1.2.8/30 [90/40640000] via 10.1.203.2, 00:02:19, Serial1/1
D 10.1.1.8/30 [90/40640000] via 10.1.103.1, 00:02:19, Serial1/2
C 10.1.3.0/30 is directly connected, Loopback31
D 10.1.2.0/30 [90/40640000] via 10.1.203.2, 00:02:19, Serial1/1
D 10.1.1.0/30 [90/40640000] via 10.1.103.1, 00:02:19, Serial1/2
C 10.1.3.4/30 is directly connected, Loopback35
D 10.1.2.4/30 [90/40640000] via 10.1.203.2, 00:02:19, Serial1/1
D 10.1.1.4/30 [90/40640000] via 10.1.103.1, 00:02:19, Serial1/2
C 10.1.103.0/29 is directly connected, Serial1/2
D 10.1.102.0/29 [90/41024000] via 10.1.203.2, 00:02:19, Serial1/1
[90/41024000] via 10.1.103.1, 00:02:19, Serial1/2
C 10.1.203.0/29 is directly connected, Serial1/1
R3#tclsh
R3(tcl)#foreach address {
+>(tcl)#10.1.1.1
+>(tcl)#10.1.1.5
+>(tcl)#10.1.1.9
+>(tcl)#10.1.2.1
+>(tcl)#10.1.2.5
+>(tcl)#10.1.2.9
+>(tcl)#10.1.3.1
+>(tcl)#10.1.3.5
+>(tcl)#10.1.3.9
+>(tcl)#10.1.102.1
+>(tcl)#10.1.102.2
+>(tcl)#10.1.103.1
+>(tcl)#10.1.103.3
+>(tcl)#10.1.203.2
+>(tcl)#10.1.203.3
+>(tcl)#} {
+>(tcl)#ping $address
+>(tcl)#}
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/27/40 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/26/44 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/28/48 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/24/48 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.2.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/18/32 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.2.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/24/52 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.3.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.3.5, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.3.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.102.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/35/80 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.102.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/26/40 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.103.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/31/52 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.103.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/31/72 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.203.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/20/36 ms
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.203.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/36/68 ms
Step 3: Examine the EIGRP topology table
R3#show ip eigrp topology
IP-EIGRP Topology Table for AS(100)/ID(10.1.3.9)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.1.3.8/30, 1 successors, FD is 128256
via Connected, Loopback39
P 10.1.2.8/30, 1 successors, FD is 40640000
via 10.1.203.2 (40640000/128256), Serial1/1
P 10.1.1.8/30, 1 successors, FD is 40640000
via 10.1.103.1 (40640000/128256), Serial1/2
P 10.1.3.0/30, 1 successors, FD is 128256
via Connected, Loopback31
P 10.1.2.0/30, 1 successors, FD is 40640000
via 10.1.203.2 (40640000/128256), Serial1/1
P 10.1.1.0/30, 1 successors, FD is 40640000
via 10.1.103.1 (40640000/128256), Serial1/2
P 10.1.3.4/30, 1 successors, FD is 128256
via Connected, Loopback35
P 10.1.2.4/30, 1 successors, FD is 40640000
via 10.1.203.2 (40640000/128256), Serial1/1
P 10.1.1.4/30, 1 successors, FD is 40640000
via 10.1.103.1 (40640000/128256), Serial1/2
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 10.1.103.0/29, 1 successors, FD is 40512000
via Connected, Serial1/2
P 10.1.102.0/29, 2 successors, FD is 41024000
via 10.1.103.1 (41024000/40512000), Serial1/2
via 10.1.203.2 (41024000/40512000), Serial1/1
P 10.1.203.0/29, 1 successors, FD is 40512000
via Connected, Serial1/1
在R3拓扑表中， 去往R1的10.1.1.0/30 FD 是R1
R3#show ip eigrp topology 10.1.102.0/29
IP-EIGRP (AS 100): Topology entry for 10.1.102.0/29
State is Passive, Query origin flag is 1, 2 Successor(s), FD is 41024000
Routing Descriptor Blocks:
10.1.103.1 (Serial1/2), from 10.1.103.1, Send flag is 0x0
Composite metric is (41024000/40512000), Route is Internal
Vector metric:
Minimum bandwidth is 64 Kbit
Total delay is 40000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
10.1.203.2 (Serial1/1), from 10.1.203.2, Send flag is 0x0
Composite metric is (41024000/40512000), Route is Internal
Vector metric:
Minimum bandwidth is 64 Kbit
Total delay is 40000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
The output of this command shows the following information regarding EIGRP:
• The bandwidth metric represents the minimum bandwidth among all links comprising the path to the destination network.
• The delay metric represents the total delay over the path.
• The minimum MTU represents the smallest MTU along the path.
• If you do not have full knowledge of your network, you can use the hop count information to check how many Layer 3 devices are between the router and the destination network.
Step 4: observe equal-cost load balancing
R3#traceroute 10.1.102.1
Type escape sequence to abort.
Tracing the route to 10.1.102.1
1 10.1.203.2 24 msec
10.1.103.1 36 msec
10.1.203.2 60 msec