CCNP Learning notes 17--vlan routing between

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