CCIE-Wireless lab prep - notas - LoadBalancing e IPv6

Etherchannel Load-Balancing

(config)#port-channel load-balance <tipo de lb>

(config)#port-channel load-balance ?

  dst-ip       Dst IP Addr

  dst-mac      Dst Mac Addr

  src-dst-ip   Src XOR Dst IP Addr

  src-dst-mac  Src XOR Dst Mac Addr

  src-ip       Src IP Addr

  src-mac      Src Mac Addr

Com WLCs é boa prática usar src-dst-ip

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IPV6

configurar ipv6 num interface

O mais básico e simples é deixar que os equipamentos configurem automaticamente:

(config-if)# ipv6 address autoconfig

é atribuído automaticamente um endereço baseado nos prefixos em Router Advertisement, em formato eui-64.

Em alternativa, é possível configurar os endereços de acordo com os seguintes comandos:

(config)#int <slot>/<port>

(config-if)#ipv6 add <ipv6 address> <type>

 

·         ipv6 address ipv6-prefix/prefix-length eui-64

·         ipv6 address ipv6-prefix/prefix-length link-local

·         ipv6 address ipv6-prefix/prefix-length anycast

Example:

Device(config-if)# ipv6 address 2001:DB8:0:1::/64 eui-64

·         Specifying the ipv6 address eui-64 command configures global IPv6 addresses with an interface identifier (ID) in the low-order 64 bits of the IPv6 address. Only the 64-bit network prefix for the address needs to be specified; the last 64 bits are automatically computed from the interface ID.

Example:

Device(config-if)# ipv6 address FE80::260:3EFF:FE11:6770 link-local

·         Specifying the ipv6 address link-local command configures a link-local address on the interface that is used instead of the link-local address that is automatically configured when IPv6 is enabled on the interface.

Example:

Device(config-if) ipv6 address 2001:DB8:1:1:FFFF:FFFF:FFFF:FFFE/64 anycast

·         Specifying the ipv6 address anycast command adds an IPv6 anycast address.

IPv6 Address Type: Anycast

An anycast address is an address that is assigned to a set of interfaces that typically belong to different nodes. A packet sent to an anycast address is delivered to the closest interface (as defined by the routing protocols in use) identified by the anycast address. Anycast addresses are syntactically indistinguishable from unicast addresses, because anycast addresses are allocated from the unicast address space. Assigning a unicast address to more than one interface makes a unicast address an anycast address. Nodes to which the anycast address is assigned must be explicitly configured to recognize that the address is an anycast address.

CCIE-Wireless lab prep - back to basics - DTP, STP, Etherchannels

DTP (Dynamic Trunk Protocol) - Se porta estiver configurada com switchport mode dynamic DTP configura a porta como access ou trunk automaticamente. Não costuma ser problema porque configurar switchport mode access ou trunk evitam o DTP mas caso se pretenda desabilitar DTP numa porta fazer o comando “switchport nonnegociate”

Tagging da native VLAN!!!

(config)#vlan dot1q tag native

#sho vlan dot1q tag native

Spantree Protocol

default of 32768. “Quanto menos, melhor”

(config)#span vlan <vlan> priority <prio>

Configura a priority manualmente.

(config)#span vlan <vlan> root primary

Aplica automaticamente o comando “span vlan <vlan> prio <prio>” de modo a que o SW tenha prio menor da rede.

(config)#span vlan <vlan> root secondary

Aplica automaticamente o comando “span vlan <vlan> prio <prio>” de modo a que o SW tenha a segunda menor prior da rede.

(config)#int <slot>/<port>

(config-if)#spanning-tree vlan <vlan> cost <cost>

Aumenta o “custo” de interface

(config)#int <int>

(config-if)#span vlan <vlan> port-priority <prio>

Atribui prioridade a um interface específico.

(config)#span portfast bpduguard default

Bpduguard – configurado geralmente em portas access. Serve para impedir que um rogue switch lixe a spanning tree.

(config)#span portf bpdufilter default

Bpdufilter – retira a porta do spanning tree. Pode provocar loops porque o interface não tem STP para evitar loops

“Então e se o switch está no meio do monte e a porta ficar em errdisable? Tenho de lá ir?”

(config)#errdisable recovery cause <causa>

(config)#errdisable recovery cause bpduguard

(config)#errdisable recovery interval <seconds>

Etherchannel

Mode ON – etherchannel manual

LACP – open protocol

PAgP – protocol cisco

(config-if)#channel-group <po id> mode <mode>

(config-if)#channel-group <po id> mode <mode>

  active     Enable LACP unconditionally

  auto       Enable PAgP only if a PAgP device is detected

  desirable  Enable PAgP unconditionally

  on         Enable Etherchannel only

  passive    Enable LACP only if a LACP device is detected

Active	Passive	Ok	LACP
Active	Active	Ok
Passive	Passive	nope
Auto	Auto	nope	PAgP
Auto	Desirable	Ok
Desirable	Desirable	Ok
ON	ON	Ok	manual
ON	≠ ON	nope