Implementation method:
1, single-arm routing
2, 3-layer SVI interface
Single-arm routing experiment:
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R1:
int e0/0
No Shu
int e0/0.1
EnCap dot1q 10
IP Add 11.1.1.1 255.255.255.0
No Shu
int e0/0.2
EnCap dot1q 20
IP Add 22.1.1.1 255.255.255.0
SW1:
int F0/10
SWI Trunk EnCap dot1q
SWI Mode Trunk
SWI Nonegotiate Close Negotiation
SWI Trun allowed VLAN 10,20
No Shu
VLAN 10
VLAN 20
int F0/1
SWI Mode acc
SWI ACC VLAN 10
int F0/2
SWI Mode acc
SWI ACC VLAN 20
SW3 SW4 Analog PC
int VLAN 1
IP Add 11.1.1.2 255.255.255.0
int VLAN 1
IP Add 22.1.1.2 255.255.255.0
Advantages: Simple configuration, low cost
Cons: Single point of failure, link bandwidth bottleneck
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SVI Multilayer Switches for inter-VLAN routing
Create an SVI interface
int VLAN 10
IP Add x.x.x.x x.x.x.x
No Shu
problem !!!
When to use 2-tier forwarding, when to use 3-tier forwarding:
When SW1 received the frame, the target Mac is local SVI port, the local 3-tier routing, 3-layer forwarding
When the SW1 received the frame, the target Mac is not the local SVI port, the Frame 2 layer forward a R1, let R1 forward.
Because a single-arm route was previously used, the configuration of SVI is also forwarded through the R1 2 layer at this point.
With the Sho ARP you can see the ip-mac corresponding to the sw4ip corresponding to the R1 mac
Clear Arp-catch
The 3-storey SVI port was forwarded.
Question 2
What time is the SVI port up. When is it down?
1, the first to exist the corresponding VLAN
2, corresponding VLAN to include interface
3, corresponding interface, must be up
4, when there is trunk, the VLAN is either trunk allow or
Review the route forwarding data process:
One layer: see the leader character.
Electrical signal, 8 bytes 1010101010101010 Ether II
1010101010101011 802.1
Second layer: Target Mac 6 bytes; source mac 6 bytes; type 2 bytes; data; Check 4 bytes
Processing your Mac will be forwarded to Layer 3:
The packet received, the target is the local interface of the Mac
Broadcast frame
Locally monitored multicast frames
Layer Three: Destination IP is local interface, direct forwarding
is not a local IP, it is anza by the table
In the case of multi-layer switches, when packets are received that are neither local nor broadcast, nor listener multicast, they will be broadcast. And the router discards such frames
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Cam Table =mac Table
TACM table =acl + routing table
ARP suppression prevents excessive ARP requests, resulting in a large number of broadcasts
Suppression time 2s. No other ARP requests will be accepted within 2s. If a neighbor is not established after 2s, the next ARP request is activated.
CCNP Learning notes 17--vlan routing between