Cis82 discard route

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Harjanto Handi Kusumo

Tecnologia Negócios

Discard Routes and
Avoiding Routing Loops

Rick Graziani
Cabrillo College

Scenario

ISP Network

ISP
ISP has static routes for
172.16.0.0/16 and RTA has a static default
192.168.1.0/24 to RTA route 0.0.0.0/0 to ISP

Central Office Remote Office
172.16.1.0/24

RTA
172.16.4.0/24

172.16.2.0/24

172.16.3.0/24
172.16.5.0/24
192.168.1.0/24

RTB RTC

Customer Network
172.16.0.0/16 and 192.168.1.0/24

Rick Graziani graziani@cabrillo.edu 2

Situation Normal

RouterA#show ip route

172.16.0.0/24 is subnetted, 3 subnets
C 172.16.1.0 is directly connected, Ethernet0
C 172.16.2.0 is directly connected, Ethernet1
R 172.16.3.0 [120/1] via 172.16.2.1, 00:00:20, Ethernet1
R 172.16.4.0 [120/2] via 172.16.2.1, 00:00:20, Ethernet1
S* 0.0.0.0/0 is directly connected, Serial1

Rick Graziani graziani@cabrillo.edu 3

Link Down

X

Rick Graziani graziani@cabrillo.edu 4

Link Down

X

RouterA#show ip route

172.16.0.0/24 is subnetted, 3 subnets
C 172.16.1.0 is directly connected, Ethernet0
C 172.16.2.0 is directly connected, Ethernet1
S* 0.0.0.0/0 is directly connected, Serial1

Rick Graziani graziani@cabrillo.edu 5

Link down – Solution
#1: no ip classless X

RouterA#show ip route

172.16.0.0/24 is subnetted, 3 subnets
C 172.16.1.0 is directly connected, Ethernet0
C 172.16.2.0 is directly connected, Ethernet1
S* 0.0.0.0/0 is directly connected, Serial1

Rick Graziani graziani@cabrillo.edu 6

Link down – Solution
#2: Discard Route
X

RTA(config)# ip route 172.16.0.0 255.255.0.0 null0

Rick Graziani graziani@cabrillo.edu 7

Link down – Solution
#2: Discard Route
X

RTA(config)# ip route 172.16.0.0 255.255.0.0 null0

RouterA#show ip route

172.16.0.0/16 is subnetted, 3 subnets, 2 masks
S 172.16.0.0/16 is directly connected, Null0
C 172.16.1.0/24 is directly connected, Ethernet0
C 172.16.2.0/24 is directly connected, Ethernet1
S* 0.0.0.0/0 is directly connected, Serial1

Rick Graziani graziani@cabrillo.edu 8

Link down – Solution #2: Discard Route

RouterA#show ip route

172.16.0.0/16 is subnetted, 3 subnets, 2 masks
S 172.16.0.0/16 is directly connected, Null0
C 172.16.1.0/24 is directly connected, Ethernet0
C 172.16.2.0/24 is directly connected, Ethernet1
S* 0.0.0.0/0 is directly connected, Serial1

• When all links are up…
RouterA#show ip route

172.16.0.0/16 is subnetted, 5 subnets, 2 masks
S 172.16.0.0/16 is directly connected, Null0
C 172.16.1.0/24 is directly connected, Ethernet0
C 172.16.2.0/24 is directly connected, Ethernet1
R 172.16.3.0/24 [120/1] via 172.16.2.1, 00:00:20, Ethernet1
R 172.16.4.0/24 [120/2] via 172.16.2.1, 00:00:20, Ethernet1
S* 0.0.0.0/0 is directly connected, Serial1

Rick Graziani graziani@cabrillo.edu 9

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Cis82 discard route

1. Discard Routes and Avoiding Routing Loops Rick Graziani Cabrillo College

2. Scenario ISP Network ISP ISP has static routes for 172.16.0.0/16 and RTA has a static default 192.168.1.0/24 to RTA route 0.0.0.0/0 to ISP Central Office Remote Office 172.16.1.0/24 RTA 172.16.4.0/24 172.16.2.0/24 172.16.3.0/24 172.16.5.0/24 192.168.1.0/24 RTB RTC Customer Network 172.16.0.0/16 and 192.168.1.0/24 Rick Graziani graziani@cabrillo.edu 2

3. Situation Normal RouterA#show ip route 172.16.0.0/24 is subnetted, 3 subnets C 172.16.1.0 is directly connected, Ethernet0 C 172.16.2.0 is directly connected, Ethernet1 R 172.16.3.0 [120/1] via 172.16.2.1, 00:00:20, Ethernet1 R 172.16.4.0 [120/2] via 172.16.2.1, 00:00:20, Ethernet1 S* 0.0.0.0/0 is directly connected, Serial1 Rick Graziani graziani@cabrillo.edu 3

4. Link Down X Rick Graziani graziani@cabrillo.edu 4

5. Link Down X RouterA#show ip route 172.16.0.0/24 is subnetted, 3 subnets C 172.16.1.0 is directly connected, Ethernet0 C 172.16.2.0 is directly connected, Ethernet1 S* 0.0.0.0/0 is directly connected, Serial1 Rick Graziani graziani@cabrillo.edu 5

6. Link down – Solution #1: no ip classless X RouterA#show ip route 172.16.0.0/24 is subnetted, 3 subnets C 172.16.1.0 is directly connected, Ethernet0 C 172.16.2.0 is directly connected, Ethernet1 S* 0.0.0.0/0 is directly connected, Serial1 Rick Graziani graziani@cabrillo.edu 6

7. Link down – Solution #2: Discard Route X RTA(config)# ip route 172.16.0.0 255.255.0.0 null0 Rick Graziani graziani@cabrillo.edu 7

8. Link down – Solution #2: Discard Route X RTA(config)# ip route 172.16.0.0 255.255.0.0 null0 RouterA#show ip route 172.16.0.0/16 is subnetted, 3 subnets, 2 masks S 172.16.0.0/16 is directly connected, Null0 C 172.16.1.0/24 is directly connected, Ethernet0 C 172.16.2.0/24 is directly connected, Ethernet1 S* 0.0.0.0/0 is directly connected, Serial1 Rick Graziani graziani@cabrillo.edu 8

9. Link down – Solution #2: Discard Route RouterA#show ip route 172.16.0.0/16 is subnetted, 3 subnets, 2 masks S 172.16.0.0/16 is directly connected, Null0 C 172.16.1.0/24 is directly connected, Ethernet0 C 172.16.2.0/24 is directly connected, Ethernet1 S* 0.0.0.0/0 is directly connected, Serial1 • When all links are up… RouterA#show ip route 172.16.0.0/16 is subnetted, 5 subnets, 2 masks S 172.16.0.0/16 is directly connected, Null0 C 172.16.1.0/24 is directly connected, Ethernet0 C 172.16.2.0/24 is directly connected, Ethernet1 R 172.16.3.0/24 [120/1] via 172.16.2.1, 00:00:20, Ethernet1 R 172.16.4.0/24 [120/2] via 172.16.2.1, 00:00:20, Ethernet1 S* 0.0.0.0/0 is directly connected, Serial1 Rick Graziani graziani@cabrillo.edu 9

10. Discard Routes and Avoiding Routing Loops Rick Graziani Cabrillo College

Cis82 discard route

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