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Suggest You - Cisco Certification: An Introduction To Multilayer Switching And SVIs
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SW1(config-if)#ip address 30.1.1.11 255.255.255.0
At this point, we’ve still got a problem when we look at the routing table.
SW1# show ip route
Default gateway is not set
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
The problem is that we don’t have a routing tab
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Why? We can use an SVI to allow inter-VLAN communication on a multilayer switch, eliminating the need for a separate router to get involved.
In this example, we have Host_1 in VLAN 11 and Host_3 in VLAN 33. Before we begin configuring, we'll send pings between the two hosts. (We’ll use Cisco routers for the hosts in this lab, which is why the ping output may look familiar!)
HOST_1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:.....
Success rate is 0 percent (0/5)
HOST_3#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:.....
Success rate is 0 percent (0/5)
As we expect, there’s no IP connectivity between the hosts. Assuming the appropriate switch ports are already placed in VLAN 11 and VLAN 33, we’ll now create two switched virtual interfaces on this multilayer switch. One will represent VLAN 33, and the other will represent VLAN 11.
SW1(config)#int vlan11
01:30:04: %LINK-3-UPDOWN: Interface Vlan11, changed state to up
01:30:05: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan11, changed state to up
SW1(config-if)#ip address 20.1.1.11 255.255.255.0
SW1(config-if)#int vlan33
01:30:11: %LINK-3-UPDOWN: Interface Vlan33, changed state to up
01:30:12: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan33, changed state to up
SW1(config-if)#ip address 30.1.1.11 255.255.255.0
At this point, we’ve still got a problem when we look at the routing table.
SW1# show ip route
Default gateway is not set
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
The problem is that we don’t have a routing tabl
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HOST_1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:.....
Success rate is 0 percent (0/5)
HOST_3#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:.....
Success rate is 0 percent (0/5)
As we expect, there’s no IP connectivity between the hosts. Assuming the appropriate switch ports are already placed in VLAN 11 and VLAN 33, we’ll now create two switched virtual interfaces on this multilayer switch. One will represent VLAN 33, and the other will represent VLAN 11.
SW1(config)#int vlan11
01:30:04: %LINK-3-UPDOWN: Interface Vlan11, changed state to up
01:30:05: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan11, changed state to up
SW1(config-if)#ip address 20.1.1.11 255.255.255.0
SW1(config-if)#int vlan33
01:30:11: %LINK-3-UPDOWN: Interface Vlan33, changed state to up
01:30:12: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan33, changed state to up
SW1(config-if)#ip address 30.1.1.11 255.255.255.0
At this point, we’ve still got a problem when we look at the routing table.
SW1# show ip route
Default gateway is not set
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
The problem is that we don’t have a routing tab
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Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds:.....
Success rate is 0 percent (0/5)
As we expect, there’s no IP connectivity between the hosts. Assuming the appropriate switch ports are already placed in VLAN 11 and VLAN 33, we’ll now create two switched virtual interfaces on this multilayer switch. One will represent VLAN 33, and the other will represent VLAN 11.
SW1(config)#int vlan11
01:30:04: %LINK-3-UPDOWN: Interface Vlan11, changed state to up
01:30:05: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan11, changed state to up
SW1(config-if)#ip address 20.1.1.11 255.255.255.0
SW1(config-if)#int vlan33
01:30:11: %LINK-3-UPDOWN: Interface Vlan33, changed state to up
01:30:12: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan33, changed state to up
SW1(config-if)#ip address 30.1.1.11 255.255.255.0
At this point, we’ve still got a problem when we look at the routing table.
SW1# show ip route
Default gateway is not set
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
The problem is that we don’t have a routing tab
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SW1(config)#int vlan11
01:30:04: %LINK-3-UPDOWN: Interface Vlan11, changed state to up
01:30:05: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan11, changed state to up
SW1(config-if)#ip address 20.1.1.11 255.255.255.0
SW1(config-if)#int vlan33
01:30:11: %LINK-3-UPDOWN: Interface Vlan33, changed state to up
01:30:12: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan33, changed state to up
SW1(config-if)#ip address 30.1.1.11 255.255.255.0
At this point, we’ve still got a problem when we look at the routing table.
SW1# show ip route
Default gateway is not set
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
The problem is that we don’t have a routing tab
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SW1(config-if)#ip address 30.1.1.11 255.255.255.0
At this point, we’ve still got a problem when we look at the routing table.
SW1# show ip route
Default gateway is not set
Host Gateway Last Use Total Uses Interface
ICMP redirect cache is empty
The problem is that we don’t have a routing table, because IP routing is off by default on a multilayer switch. Let’s turn IP routing on and then check the routing table.
SW1(config)#ip routing
SW1(config)#^Z
SW1#show ip route
Gateway of last resort is not set
20.0.0.0/24 is subnetted, 1 subnets
C 20.1.1.0 is directly connected, Vlan11
30.0.0.0/24 is subnetted, 1 subnets
C 30.1.1.0 is directly connected, Vlan33
Now we’re in good shape! The hosts need to have their default gateway set to the appropriate SVI IP address; here, Host_1 should have its gateway set to 20.1.1.11, and Host_3 to 30.1.1.11. After doing so, inter-VLAN communication is now in place, as shown by the ping output below.
HOST_1#ping 30.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds: !!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
HOST_3#ping 20.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds: !!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
In a future Cisco certification tutorial, we’ll take a look at configuring a multilayer switch port as a routed port, and assign an IP address to that port. See you then!
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