Differences

This shows you the differences between two versions of the page.

--- wiki:site:cisco:ccnp:switch:vlan_trunks [2018/01/16 11:07]
root
+++ — (current)
@@ Line 1: / Line 1: @@
-====== VLAN Trunks ======
-**ISL - Inter Switch Link (Cisco)**
-  * Enkapsuluje celý L2 rámec
-  * 26-byte header (15-bit VLAN ID)
-  * 4-byte trailer (CRC)
-  * občas nazývaný //double tagging//
-**802.1Q - Standard**
-  * 4-byte pole vložené hned za SRC MAC
-  * //single tagging, internal tagging//
-  * //native// VLAN = netagovaná
-  * první 2 byty = TPID (Tag Protocol Identifier) vždy 0x8100 (802.1Q)
-  * další 2 byty = TCI (Tag Control Information)
-    * 3-bity CoS (Class of Service 802.1Q/802.1p)
-    * 1-bit CFI (Canonical Format Indicator) - určuje zda se jedná o Ethernet nebo TokenRing. Nazývá se též //little-endian, big-endian format//
-    * 12-bitů VID (VLAN Identifier) 0-4095 (0,1 a 4095 rezervovány)
-====== DTP (Cisco )- Dynamic Trunking Protocol ======
-  * Sjednává trunk (ISL nebo dot1Q)
-  * Switche musí být ve stejné VTP doméně (nebo NULL doméně, VTP domain není nakonfigurována)
->SW# **no-isl-entries enable**
->Switch(config)# **interface** //type mod/port//
->Switch(config-if)# **switchport**
->Switch(config-if)# **switchport mode {dynamic {auto | desirable} | trunk}**
->Switch(config-if)# **switchport trunk encapsulation {isl | dot1q | negotiate}**
->Switch(config-if)# **switchport nonnegotiate**
->Switch(config-if)# **switchport trunk native vlan** //vlan-id//
->Switch(config-if)# **switchport trunk allowed vlan** {//vlan-list// | **all** | {**add** | **except** | **remove**} //vlan-list//}
-Vypnutí DTP:
->Switch(config-if)# **switchport nonegotiate**
->Switch# **show running-config**
->Switch# **show interface** //type mod/port//
->Switch# **show vlan id** //vlan-id//
->Switch# **show interface** //type mod/num// **switchport** | **trunk**
->Switch# **show dtp** [**interface** //type mod/num//]

wiki.lkaplan.cz

User Tools

Site Tools

Differences

Page Tools