Table of Contents

(Příkazy označené tečkou fungují v GNS3 na routeru s NM-16ESW modulem)

Switch CAM Table

POZOR! příkazy lze psát dvěma způsoby:

Switch(config)# mac address-table aging-time seconds(def.300)
Switch(config)# mac address-table static aaaa.bbbb.cccc interface type mod/num vlan vlan-id
Switch# show mac address-table dynamic [address mac-address | interface type mod/num | vlan vlan-id]
Switch# show mac address-table count
Switch# clear mac address-table dynamic [address mac-address | interface type mod/num | vlan vlan-id]

Switch Port Configuration

.Switch(config)# interface type module/number
.Switch(config)# interface range type module/number [, type module/number …]
.Switch(config)# interface range type module/first-number – last-number
.Switch(config)# define interface-range macro-name type module/number [, type module/ number …] [, type module/first-number – last-number] [, …]
.Switch(config)# interface range macro macro-name

(předdefinované makro se uloží do configu)

Příklad:
Switch(config)# define interface-range MyGroup gig 2/0/1 , gig 2/0/3 – 2/0/5 , gig 3/0/1 , gig 3/0/10, gig 3/0/32 – 3/0/48
Switch(config)# interface range macro MyGroup

.Switch(config-if)# [no] shutdown
.Switch(config-if)# description description-string
.Switch(config-if)# speed {10 | 100 | 1000 | auto(defult)}
.Switch(config-if)# duplex {auto | full | half}

Konfigurace detekce chyb (errdisable)

.Switch(config)# [no] errdisable detect cause [all | cause-name]
.Switch(config)# errdisable recovery cause [all | cause-name]
.Switch(config)# errdisable recovery interval seconds

Troubleshooting

.Switch# show interface
.Switch# show interfaces status
.Switch# show interface status err-disabled

_Pro zjištění speed/duplex mismatch:_

.Switch# show interface type mod/num

VLAN Configuration

Switch(config)# [no] vlan vlan-num
Switch(config-vlan)# name vlan-name
Switch(config)# interface type module/number
Switch(config-if)# switchport (přepne port do režimu L2)
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan vlan-num
Switch# show vlan
Switch# show vlan brief
VLAN Name             Status  Ports
---- ---------------- ------- ------
1    default          active  Fa0/1,Fa0/2,Fa0/3,Fa0/10,Fa0/11,Fa0/12
20   VLAN0020         active  Fa0/5,Fa0/6,Fa0/7
21   VLAN0021         active  Fa0/8,Fa0/9
1002 fddi-default     active
1003 trcrf-default    active
1004 fddinet-default  active
1005 trbrf-default    active
Switch# show running-config interface type module/number
Building configuration...
Current configuration 64 bytes
interface FastEthernet 0/5
 switchport access vlan 20
 switchport mode access
Switch# show mac address-table interface type module/number
Mac Address Table
—————————————————————
Vlan Mac Address    Type    Ports
---- -----------    ----    -----
1    0030.b656.7c3d DYNAMIC Fa0/1
Total Mac Addresses for this criterion: 1
Switch# show interfaces type module/number switchport
Name: Fa0/1
Switchport: Enabled
Administrative Mode: dynamic desirable
Operational Mode: static access
Administrative Trunking Encapsulation: negotiate
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Protected: false
Unknown unicast blocked: false
Unknown multicast blocked: false
Broadcast Suppression Level: 100
Multicast Suppression Level: 100
Unicast Suppression Level: 100

Alternativně (GNS3):

Router# vlan database
Router(vlan)# [no] vlan vlan-num
Router# show vlan-switch
Router# show vlan-switch brief

VLAN Trunk Configuration

Switch(config)# interface type mod/port
Switch(config-if)# switchport
Switch(config-if)# switchport trunk encapsulation {isl | dot1q | negotiate}
Switch(config-if)# switchport trunk native vlan vlan-id
Switch(config-if)# switchport trunk allowed vlan {vlan-list | all | {add | except | remove} vlan-list}
Switch(config-if)# switchport mode {trunk | dynamic {desirable | auto}}

Ve všech režimech DTP posílá zprávy každých 30s.

Switch(config-if)# switchport nonegotiate
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]

DTP - Dynamic Trunking Protocol

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}

Ve všech režimech DTP posílá zprávy každých 30s.

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]
Switch# show interfaces fastethernet 0/1 trunk
Port    Mode      Encapsulation  Status    Native vlan
Fa0/1  desirable  n-802.1q       trunking   1
Port   Vlans allowed on trunk
Fa0/1  1-150
<further output omitted>

VTP - Vlan Trunking Protocol

Switch(config)# vtp domain domain-name …(max.32 znaků)
Switch(config)# vtp mode {server | client | transparent}
Switch(config)# vtp version {1 | 2} …(def.1)
Switch(config)# vtp password password

VTP Pruning

Switch(config)# vtp pruning
Switch(config)# interface type mod/num
Switch(config-if)# switchport trunk pruning vlan **except** | **remove**} //vlan-list//} | **none**} VLAN 1,1002-1005 - nikdy nepodléhají pruningu (VLAN 1-kontrolní provoz) >Switch# **show vtp status** <code> VTP Version : 2 Configuration Revision : 0 Maximum VLANs supported locally : 1005 Number of existing VLANs : 5 VTP Operating Mode : Server VTP Domain Name : VTP Pruning Mode : Disabled VTP V2 Mode : Disabled VTP Traps Generation : Disabled MD5 digest : 0x57 0xCD 0x40 0x65 0x63 0x59 0x47 0xBD Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00 </code> >Switch# **show vtp counters** <code> VTP statistics: Summary advertisements received : 1 Subset advertisements received : 2 Request advertisements received : 1 Summary advertisements transmitted : 1630 Subset advertisements transmitted : 0 Request advertisements transmitted : 4 Number of config revision errors : 0 Number of config digest errors : 0 Number of V1 summary errors : 0 VTP pruning statistics: Trunk Join Transmitted Join Received Summary advts received from non-pruning-capable device ----------------- ---------------- --------------- ------------------------------- Gi0/1 82352 82931 0 </code> >Switch# **show vlan brief** >Switch# **show interface** //type mod/num// **switchport** >Switch# **show interface** //type mod/num// **pruning** ====== EtherChannel ====== Jakmile je nakonfigurován EtherChannel, switch pro něj automaticky vytvoří virt. interface. >Switch(config)# **interface port-channel** //number// >Switch(config)# **port-channel load-balance** //method// ^//method// ^Hash Operation^Switch model^ |**src-ip** | bits | all | |**dst-ip** | bits | all | |**src-dst-ip** | XOR | all | |**src-mac** | bits | all | |**dst-mac** | bits | all | |**src-dst-mac** | XOR | all | |**src-port** | bits | 4500,6500 | |**dst-port** | bits | 4500,6500 | |**src-dst-port**| XOR | 4500,6500 | __**L3 Portchannel**__\\ * Switch(config-if)# **no switchport** * Switch(config-if)# **ip address** //address mask// ===== PaGP ===== >Switch(config)# **interface** //type mod/num// >Switch(config-if)# **channel-protocol pagp** >Switch(config-if)# **channel-group** //number// **mode** {**on** | {{**auto** | **desirable**} [**non-silent**]

non-silent - sw standartně v módu auto a desirable ani nečeká na žádné pagp zprávy (z důvodu připojení zař.,které pagp neumí), tímto příkazem aktivujeme posílání a očekávání pagp zpráv

LACP

Switch(config)# lacp system-priority priority(1-65535, def.32768)
Switch(config)# interface type mod/num
Switch(config-if)# channel-protocol lacp
Switch(config-if)# channel-group number(1-64) mode {on | passive | active}
Switch(config-if)# lacp port-priority priority(1-65535, def.32768)

Troubleshooting

Switch# show etherchannel summary
Switch# show etherchannel summary
Flags:  D - down         P - in port-channel
        I - stand-alone  s - suspended
        H - Hot-standby (LACP only)
        R - Layer3       S - Layer2
        u - unsuitable for bundling
        U - in use       f - failed to allocate aggregator
        d - default port
Number of channel-groups in use: 1
Number of aggregators:           1

Group  Port-channel   Protocol    Ports
------+--------------+-----------+------------------------------------------------

1      Po1(SU)         PAgP            Fa0/41(P) Fa0/42(P) Fa0/43 Fa0/44(P)
                                  Fa0/45(P) Fa0/46(P) Fa0/47(P) Fa0/48(P)
Switch# show etherchannel port
                  Channel-group listing:
                  -----------------------
Group: 1
----------
Ports in the group:
--------------------
Port: Fa0/41
------------

Port state    = Up Mstr In-Bndl
Channel group = 1        Mode = Desirable-Sl      Gcchange            = 0
Port-channel  = Po1      GC   = 0x00010001        Pseudo port-channel = Po1
Port index    = 0        Load = 0x00              Protocol            = PAgP

Flags:  S - Device is sending Slow hello.  C - Device is in Consistent state.
        A - Device is in Auto mode.        P - Device learns on physical port.
        d - PAgP is down.
Timers: H - Hello timer is running.        Q - Quit timer is running.
        S - Switching timer is running.    I - Interface timer is running.
        
Local information:
                                 Hello     Partner  PAgP       Learning  Group
Port     Flags  State   Timers   Interval  Count    Priority   Method    Ifindex
Fa0/41   SC     U6/S7   H        30s       1        128        Any       55

Partner’s information:

         Partner       Partner           Partner              Partner   Group
Port     Name          Device ID         Port           Age   Flags     Cap.

Fa0/41   FarEnd        00d0.5849.4100    3/1            19s   SAC       11

Age of the port in the current state: 00d:08h:05m:28s
show running-config interface type mod/ num
show interface type mod/num etherchannel
show etherchannel port-channel
show etherchannel detail
show etherchannel load-balance
show etherchannel port-channel
show {pagp | lacp} neighbor
show lacp sys-id

STP Spanning-tree protocol

Switch(config)# [no] spanning-tree vlan vlan-id
Switch(config-if)# [no] spanning-tree vlan vlan-id
# show spanning interface type mod/port
# debug spanning-tree switch state

STP Root Bridge:

Switch(config)# [no] spanning-tree extended system-id
Switch(config)# spanning-tree vlan vlan-list priority bridge-priority
Switch(config)# spanning-tree vlan vlan-id root {primary | secondary} [diameter diameter]
Switch(config)# spanning-tree vlan 1 root primary
vlan 1 bridge priority set to 24576
vlan 1 bridge max aging time unchanged at 20
vlan 1 bridge hello time unchanged at 2
vlan 1 bridge forward delay unchanged at 15

Root Path Cost:

Switch(config-if)# spanning-tree [vlan vlan-id] cost cost(1-65535)
Switch# show spanning-tree interface type mod/num [cost]
Switch# show spanning-tree interface fa0/1
Vlan              Role Sts Cost       Prio.Nbr Type
----------------- ---- --- ---------- -------- -----------------------------
VLAN0001          Root FWD 4          128.1    P2p
VLAN0010          Desg FWD 4          128.1    P2p
VLAN0020          Root FWD 4          128.1    P2p

Port Priority:

Switch(config-if)# spanning-tree [vlan vlan-list] port-priority port-priority(0-255,def.128)
Switch# show spanning-tree interface type mod/num

STP Timers:

Nastavovat jen na ROOTOVI!!!

Manuální konfigurace:

Switch(config)# spanning-tree [vlan vlan-id] hello-time seconds(1-10,def.2)
Switch(config)# spanning-tree [vlan vlan-id] forward-time seconds(4-30,def.15)
Switch(config)# spanning-tree [vlan vlan-id] max-age seconds(6-40,def.20)

Automatická konfigurace pomocí makra:

Switch(config)# spanning-tree vlan vlan-list root {primary | secondary} [diameter diameter [hello-time hello-time]]

PortFast

Switch(config)# spanning-tree portfast default
Switch(config-if)# [no] spanning-tree portfast
Switch(config-if)# switchport host
Switch(config-if)# switchport host
switchport mode will be set to access
spanning-tree portfast will be enabled
channel group will be disabled
Switch# show spanning-tree interface type mod/num portfast

UplinkFast

Switch(config)# spanning-tree uplinkfast [max-update-rate pkts-per-second(0-65535,def.150)]
Switch# show spanning-tree uplinkfast
Switch# show spanning-tree uplinkfast
UplinkFast is enabled
Station update rate set to 150 packets/sec.
UplinkFast statistics
Number of transitions via uplinkFast (all VLANs)             : 2
Number of proxy multicast addresses transmitted (all VLANs)  : 52

Name                  Interface List
--------------------- --------------------------------
VLAN0001              Gi0/1(fwd)
VLAN0010              Gi0/1(fwd)
VLAN0100              Gi0/1(fwd)

BackboneFast

Switch(config)# spanning-tree backbonefast
Switch# show spanning-tree backbonefast
Switch# show spanning-tree backbonefast
BackboneFast is enabled

Root Guard

Switch(config-if)# spanning-tree guard root
Switch# show spanning-tree inconsistentports

BPDU Guard

Switch(config)# spanning-tree portfast bpduguard default
Switch(config-if)# [no] spanning-tree bpduguard enable
Switch# show spanning-tree summary
Switch# show spanning-tree summary totals

Loop Guard

Switch(config)# spanning-tree loopguard default
Switch(config-if)# [no] spanning-tree guard loop
Switch# show spanning-tree summary

UDLD

Switch(config)# udld {enable | aggressive | message time seconds(7-90,def.7 or 15)}
Switch(config-if)# udld {enable | aggressive | disable}
Switch# show udld interface type mod/num
Switch# udld reset

BPDU Filter

Switch(config)# spanning-tree bpdufilter default
Switch(config-if)# spanning-tree bpdufilter {enable | disable}
Switch# show spanning-tree summary

Troubleshooting STP

Switch# show spanning-tree [detail]
Switch# show spanning-tree vlan vlan-id
Switch# show spanning-tree [vlan vlan-id] summary [totals]
Switch# show spanning-tree [vlan vlan-id] root
Switch# show spanning-tree [vlan vlan-id] bridge
Switch# show spanning-tree bridge brief
Switch# show spanning-tree interface type mod/num
Switch# show spanning-tree interface type mod/num detail
Switch# show spanning-tree interface type mod/num cost
Switch# show spanning-tree interface type mod/num portfast
Switch# show spanning-tree uplinkfast
Switch# show spanning-tree backbonefast
Switch# show spanning-tree inconsistentports
Switch# show udld interface type mod/num

Rapid PVST+

Konfigurace edge portů:

Switch(config-if)# spanning-tree portfast

Nastavení p2p pro half-duplex linku: (propojení switchů na half-duplexu)

Switch(config-if)# spanning-tree link-type point-to-point

Zapnutí RPVSTP+:

Switch(config)# spanning-tree mode rapid-pvst

Přechod zpět na PVST+:

Switch(config)# spanning-tree mode pvst
Switch# show spanning-tree
Switch# show spanning-tree vlan vlan-id
Switch#show spanning-tree vlan 1
VLAN0001
  Spanning tree enabled protocol rstp
  Root ID    Priority    0
             Address     0001.421C.5EA1
             Cost        4
             Port        25(GigabitEthernet0/1)
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec

  Bridge ID  Priority    1  (priority 0 sys-id-ext 1)
             Address     0060.3E78.B994
             Hello Time  2 sec  Max Age 20 sec  Forward Delay 15 sec
             Aging Time  20

Interface        Role Sts Cost      Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/23           Altn BLK 19        128.23   P2p
Fa0/24           Altn BLK 19        128.24   P2p
Gi0/1            Root FWD 4         128.25   P2p
Gi0/2            Desg FWD 4         128.26   Shr

MST - Multiple Spanning Tree

SW(config)# spanning-tree mode mst
SW(config)# spanning-tree mst configuration
SW(config-mst)# name region_name (32 znaků)
SW(config-mst)# revision number (0-35535)
SW(config-mst)# instance number(0-15) vlan vlan_range
SW(config)# spanning-tree mst instance-id root {primary | secondary}[diameter diameter]
SW(config)# spanning-tree mst instance-id priority bridge-priority
SW(config-if)# spanning-tree mst instance-id cost cost
SW(config-if)# spanning-tree mst instance-id port-priority port-priority
SW(config)# spanning-tree mst hello-time seconds
SW(config)# spanning-tree mst forward-time seconds
SW(config)# spanning-tree mst max-age seconds
SW(config-mst)# show pending
SW# show spanning-tree mst

Multilayer switching

InterVLAN Routing

Switch# show interface type mod/num switchport
Switch# show interface gigabitethernet 0/1 switchport
Name: Gi0/1
Switchport: Disabled
Switch#

Konfigurace L2 portu:

Switch(config)# interface type mod/num
Switch(config-if)# switchport
Switch(config-if)# no shutdown

Konfigurace L3 portu:

Switch(config)# interface type mod/num
Switch(config-if)# no switchport
Switch(config-if)# ip address ip-address mask [secondary]
Switch(config-if)# no shutdown

Konfigurace SVI portu:

Switch(config)# vlan vlan-id
Switch(config-vlan)# name vlan-name
Switch(config-vlan)# exit
Switch(config)# interface vlan vlan-id
Switch(config-if)# ip address ip-address mask [secondary]
Switch(config-if)# no shutdown
Switch# show interface vlan vlan-id
Switch# show vlan
Switch# show ip interface brief

Autostate of a SVI

Zajistí, že tento interfejs nebude mít vliv na stav SVI:

Switch(config-if)# switchport autostate exclude

CEF Cisco Express Forwarding

Na Cat3750 a 4500 lze vypnout:

Switch(config-if)# no ip route-cache cef
Switch(config-if)# no ip cef

FIB table

Switch# show ip cef [type mod/num | vlan vlan-id] [detail]
Switch# show ip cef vlan 101
Prefix			Next Hop		Interface
10.1.1.0/24 		attached 		Vlan101
10.1.1.2/32 		10.1.1.2 		Vlan101
10.1.1.3/32 		10.1.1.3 		Vlan101
Switch# show ip cef [prefix-ip prefix-mask] [longer-prefixes] [detail]

longer-prefixes - vypíše i routy s delší maskou než která byla specifikována v příkazu

Switch# show ip cef 10.1.0.0 255.255.0.0 longer-prefixes
Prefix 			Next Hop 		Interface
10.1.1.0/24 		attached 		Vlan101
10.1.1.2/32 		10.1.1.2 		Vlan101
10.1.1.3/32 		10.1.1.3 		Vlan101
10.1.2.0/24 		attached 		Vlan102
10.1.3.0/26 		192.168.1.2 		Vlan99
			192.168.1.3 		Vlan99
10.1.3.64/26 		192.168.1.2 		Vlan99
			192.168.1.3 		Vlan99
10.1.3.128/26		192.168.1.4 		Vlan99
			192.168.1.3	 	Vlan99
[output omitted]
Switch# show ip cef 10.1.3.0 255.255.255.192 detail
10.1.3.0/26, version 270, epoch 0, per-destination sharing
0 packets, 0 bytes
   via 192.168.1.2, Vlan99, 0 dependencies
      traffic share 1
      next hop 192.168.1.2, Vlan99
      valid adjacency
   via 192.168.1.3, Vlan99, 0 dependencies
      traffic share 1
      next hop 192.168.1.3, Vlan99
      valid adjacency
   0 packets, 0 bytes switched through the prefix
   tmstats: external 0 packets, 0 bytes
            internal 0 packets, 0 byte

Adjacency table

Switch# show adjacency [type mod/num | vlan vlan-id] [summary | detail]
Switch# show adjacency summary
Adjacency Table has 106 adjacencies
   Table epoch: 0 (106 entries at this epoch)
   Interface		Adjacency Count
   Vlan99 		21
   Vlan101 		3
   Vlan102 		1
   Vlan103 		47
   Vlan104 		7
   Vlan105 		27
Switch# show adjacency vlan 99 detail
Protocol   Interface		Address
IP	   Vlan99		192.168.1.2(5)
  				   0 packets, 0 bytes
				   000A5E45B145000E387D51000800
				   ARP		01:52:50
				   Epoch: 0
IP	   Vlan99		192.168.1.3(5)
				   1 packets, 104 bytes
				   000CF1C909A0000E387D51000800
				   ARP		04:02:11
				   Epoch: 0

Adjacency “glean state”:

Switch# show ip cef adjacency glean
Prefix 			Next Hop		Interface
10.1.1.2/32 		attached 		Vlan101
127.0.0.0/8 		attached 		EOBC0/0
[output omitted]

Switch# show ip arp 10.1.1.2

Switch# show ip cef 10.1.1.2 255.255.255.255 detail
10.1.1.2/32, version 688, epoch 0, attached, connected
0 packets, 0 bytes
   via Vlan101, 0 dependencies
      valid glean adjacency
Switch# show cef drop
CEF Drop Statistics
Slot	Encap_fail	Unresolved	Unsupported	No_route 	No_adj	ChkSum_Err
RP	   8799327		 1	      45827	5089667 	    32 		0
Switch# show cef not-cef-switched
CEF Packets passed on to next switching layer
Slot   No_adj   No_encap   Unsupp’ted   Redirect   Receive   Options   Access   Frag
RP    3579706          0            0          0  41258564         0        0      0

DHCP na MLS

Konfigurace DHCP serveru

Switch(config)# ip dhcp excluded-address start-ip end-ip
Switch(config)# ip dhcp pool pool-name
Switch(config-dhcp)# network ip-address subnet-mask
Switch(config-dhcp)# default-router ip-address [ip-address2] [ip-adress3] …
Switch(config-dhcp)# lease {infinite | {days [hours [minutes]]}}
Switch# show ip dhcp binding

Konfigurace DHCP Relay

Switch(config)# interface vlan5
Switch(config-if)# ip address 192.168.1.1 255.255.255.0
Switch(config-if)# ip helper-address 192.168.199.4

HSRP

Switch(config-if)# standby group(1-255 / 1-16) priority priority(0-255, def.100)
Switch(config-if)# standby group timers [msec] hello [msec] holdtime
Switch(config-if)# standby group preempt [delay [minimum seconds] [reload seconds]]
Switch(config-if)# standby group track type mod/num [decrementvalue(def.10)]
Switch(config-if)# standby group ip ip-address [secondary]
Switch(config-if)# show standby [vlan vlan-id | type mod/num] [brief]

Plaint-text Authentikace:

Switch(config-if)# standby group authentication string

MD5 Authentikace - string:

Switch(config-if)# standby group authentication md5 key-string [0 | 7] string

MD5 Authentikace key-chain:

Switch(config)# key chain chain-name
Switch(config-keychain)# key key-number
Switch(config-keychain-key)# key-string [0 | 7] string
Switch(config)# interface type mod/num
Switch(config-if)# standby group authentication md5 key-chain chain-name

VRRP

Switch(config-if)# vrrp group(0-255) priority level(1-254,def.100)
Switch(config-if)# vrrp group(0-255) timers advertise [msec] interval(def.1s)
Switch(config-if)# vrrp group(0-255) timers learn
Switch(config-if)# no vrrp group(0-255) preempt
Switch(config-if)# vrrp group(0-255) preempt [delay seconds(def.0s)]
Switch(config-if)# vrrp group(0-255) authentication string
Switch(config-if)# vrrp group(0-255) ip ip-address [secondary]
Switch# show vrrp [brief]
Switch# show vrrp brief all
Switch# show vrrp interface type mod/num

GLBP

Switch(config-if)# glbp group ip [ip-address [secondary]]
Switch# show glbp [group] [brief]

AVG

Switch(config-if)# glbp group(0-1023) priority level(1-255, def.100)
Switch(config-if)# glbp group preempt [delay minimum seconds]
Switch(config-if)# glbp group timers [msec] hellotime [msec] holdtime

AVF

Switch(config-if)# glbp group timers redirect redirect timeout
Switch(config)# track object-number(1-500) interface type mod/num {line-protocol | ip routing}
Switch(config-if)# glbp group weighting maximum [lower lower] [upper upper]
Switch(config-if)# glbp group weighting track object-number [decrement value]

Load Balancing

SW_AVG(config-if)# glbp group load-balancing [round-robin | weighted | host-dependent]

Supervizor and Route Processor Redundancy

* první konfigurace se musí udělat na obou supervizorech

Router(config)# redundancy
Router(config-red)# mode {rpr | rpr-plus | sso}
Router# show redundancy states
Router# show redundancy states
	    my state = 13 -ACTIVE
	  peer state = 8 -STANDBY HOT
		Mode = Duplex
		Unit = Secondary
	   
	     Unit ID = 2

Redundancy Mode (Operational) = Route Processor Redundancy Plus
Redundancy Mode (Configured) = Route Processor Redundancy Plus
	Split Mode = Disabled
      Manual Swact = Enabled
    Communications = Up
      
      client count = 11
   client_notification_TMR = 30000 milliseconds
	    keep_alive TMR = 9000 milliseconds
	  keep_alive count = 1
      keep_alive threshold = 18
	     RF debug mask = 0x0

Synchronizace supervizorů

Router(config)# redundancy
Router(config-red)# main-cpu
Router(config-r-mc)# auto-sync {startup-config | config-register | bootvar}

Návrat do defaultu:

Router(config-r-mc)# auto-sync standard

Nonstop Forwarding

BGP

Router(config)# router bgp as-number
Router(config-router)# bgp graceful-restart

EIGRP

Router(config)# router eigrp as-number
Router(config-router)# nsf

OSPF

Router(config)# router ospf process-id
Router(config-router)# nsf

IS-IS

Router(config)# router isis process-id
Router(config-router)# nsf [cisco | ietf]
Router(config-router)# nsf interval [minutes]
Router(config-router)# nsf t3 {manual seconds | adjacency}
Router(config-router)# nsf interface wait seconds