D-H,appy

====router = switch (trunk)  (8-2)====

sw
 interface fa0/1
  switchprot trunk encapsulation dot1q (isl)
  switchport mode trunk

router
 interface fa0/0

 interface fa0/0.2
  encapsulation dot1q 2
  ip address 10.1.2.1 255.255.255.0

 interface fa0/0.3
  encapsulation dot1q 3
  ip address 10.1.3.1 255.255.255.0

=====multilayer switch  (8-3)=====

SVI (L3)
 
interface fa1/2
 switchport access vlan 2

interface vlan 2  (SVI)= L3
 ip add 10.1.2.1 255.255.255.0

interface fa1/3
 switchport access vlan 3
 
interface vlan 3
 ip add 10.1.3.1 255.255.255.0

==Multilayer Switch====
1. L2  (vlan 할당)
2. L3  (no switchport)
3. SVI  (interface vlan x)
4. routing protocol (ip routing)

===Multilayer switch===
 L3 (show ip route)  routing table  (0, 1, either) 
 L2 (show mac-address-table) mac-address table (0, 1)

===L3 ===
  1. control plane  (routing table)             software
  2. data plane       (packet forwarding)    hardware

===L3 Switching===
1. process switching (data plane => control plane => data plane)
2. fast switching (first packet process switching)
3. FIB (CEF)

 control plane  ==> routing table  (show ip route)
 data plane ==>  FIB (CEF) table   (show ip cef)

  control plane  (routing table)  show ip route
  data plane       (FIB, ADJ)         show ip cef(FIB),  show ip adj(L2 L3 mapping)

1. STP
2. L3
3. Gateway 2중화 (HSRP)

==Trunk==
1. 802.1Q
2. ISL

==Etherchannel==
1. LACP
2. PAGP

==Gateway 2중화==
1. VRRP
2. HSRP (hot standby router protocol)

====HSRP==============
R1
 interface fa0/0  (Active router)
  ip address 1.1.1.1 255.255.255.0
  standby 1 ip 1.1.1.250
  standby 1 priority 150 

R2
 interface fa0/0  (Standby router)
  ip address 1.1.1.2 255.255.255.0
  standby 1 ip 1.1.1.250
  standby 1 priority 100

======priority========

1. spanning-tree (root bridge) 
    L2 낮은  (32768)
    priority => mac
    config)#spanning-teee vlan 10 priority 327678
    preemptive

1. hsrp (active router)
    L3 높은  (100)
    priority => ip
    -if)#standby 1 priority 100
    non preemptive