Convergence Delays: SVI vs Routed Interface – Packet Life

 

interface Vlan100
 ip address 10.0.0.1 255.255.255.0
!
interface FastEthernet0/1
 switchport trunk encapsulation dot1q
 switchport mode trunk
interface FastEthernet0/1
 no switchport
 ip address 10.0.0.1 255.255.255.0

SVI Testing

Below is the log output of the first run of the SVI test. The timestamps we’re interested in are the line protocol state transition and the interface being removed from the routing table.

Jan 23 18:22:51.315: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/16, changed state to down
Jan 23 18:22:51.324: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to down
Jan 23 18:22:51.324: is_up: 0 state: 4 sub state: 1 line: 0
Jan 23 18:22:51.324: RT: interface Vlan100 removed from routing table
Jan 23 18:22:51.324: RT: del 10.0.0.0/24 via 0.0.0.0, connected metric [0/0]
Jan 23 18:22:51.324: RT: delete subnet route to 10.0.0.0/24
Jan 23 18:22:51.324: RT: delete network route to 10.0.0.0
Jan 23 18:22:52.330: %LINK-3-UPDOWN: Interface FastEthernet0/16, changed state to down

Routed Interface Testing

Again, below is the log output from the first run of the test.

Jan 23 18:28:57.671: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/17, changed state to down
Jan 23 18:28:58.669: %LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to down
Jan 23 18:28:58.669: is_up: 0 state: 0 sub state: 1 line: 0
Jan 23 18:28:58.669: RT: interface FastEthernet0/17 removed from routing table
Jan 23 18:28:58.669: RT: del 10.0.1.0/24 via 0.0.0.0, connected metric [0/0]
Jan 23 18:28:58.669: RT: delete subnet route to 10.0.1.0/24
Jan 23 18:28:58.669: RT: delete network route to 10.0.0.0
S1(config-if)# carrier-delay msec 0
Jan 23 18:45:06.316: %LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to down
Jan 23 18:45:06.316: is_up: 0 state: 0 sub state: 1 line: 0
Jan 23 18:45:06.316: RT: interface FastEthernet0/17 removed from routing table
Jan 23 18:45:06.316: RT: del 10.0.1.0/24 via 0.0.0.0, connected metric [0/0]
Jan 23 18:45:06.316: RT: delete subnet route to 10.0.1.0/24
Jan 23 18:45:06.316: RT: delete network route to 10.0.0.0
Jan 23 18:45:07.314: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/17, changed state to down
Jan 23 18:45:07.314: is_up: 0 state: 0 sub state: 1 line: 0

 

 

 

 

Convergence Delays: SVI vs Routed Interface (Packet Life)

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