Routing protocol OSPF - Revision history

Pio2pio: /* Troubleshooting */

2015-03-06T19:12:32Z

Troubleshooting

← Older revision		Revision as of 21:12, 6 March 2015
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	r1(config-router)# '''auto-cost reference-bandwidth''' ''100'' !note bandwidth value here is Mb/s		r1(config-router)# '''auto-cost reference-bandwidth''' ''100'' !note bandwidth value here is Mb/s
	r1(config-router)# '''ip ospf cost''' ''value'' !sets cost of the link		r1(config-router)# '''ip ospf cost''' ''value'' !sets cost of the link
	= Troubleshooting =		= OSPFv2 Troubleshooting =
	show ip protocols		show ip protocols
	clear ip ospf process !This forces OSPF on R1 to transition to the Down and Init states. Required if router-id needs changing		clear ip ospf process !This forces OSPF on R1 to transition to the Down and Init states. Required if router-id needs changing

Pio2pio: /* OSPFv2 router configuration for IPv4 protocol */

2015-03-06T19:12:09Z

OSPFv2 router configuration for IPv4 protocol

@@ Line 43: / Line 43: @@
   r1(config-router)# '''auto-cost reference-bandwidth''' ''100''    !note bandwidth value here is Mb/s
   r1(config-router)# '''ip ospf cost''' ''value''                   !sets cost of the link
 = OSPFv3 router configuration for IPv6 protocol =

Pio2pio: /* Troubleshooting */

2015-03-06T19:11:59Z

Troubleshooting

← Older revision		Revision as of 21:11, 6 March 2015
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	\| IPv6 authentication, IPSec authentication		\| IPv6 authentication, IPSec authentication
	\|}		\|}

	~~= Troubleshooting =~~
	~~show ip protocols~~
	~~clear ip ospf process !This forces OSPF on R1 to transition to the Down and Init states. Required if router-id needs changing~~
	~~show ip ospf neighbor !State - The OSPF state of the interface. FULL state means that the router and its neighbor have identical OSPF LSDBs.~~
	~~!On multiaccess networks, such as Ethernet, two routers that are adjacent may have their states displayed as 2WAY.~~
	~~!The dash indicates that no DR or BDR is required because of the network type.~~
	~~show ip ospf !spf, backbone area, router-id~~
	~~show ip ospf interface brief~~
	~~show ip ospf interface serial 0/0/1 !cost, bandwidth~~
	~~show interface serial 0/0/1 \| include BW !verify the current bandwidth of an interface~~

Pio2pio: /* Adjusting the Interface Bandwidth */

2015-03-06T19:11:32Z

Adjusting the Interface Bandwidth

← Older revision		Revision as of 21:11, 6 March 2015
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	Default reference bandwidth for 100Mb/s is 10^8 100.000.000 therefore Fast Ethernet 100Mbps link cost is 1. Cost is calculated using formula:		Default reference bandwidth for 100Mb/s is 10^8 100.000.000 therefore Fast Ethernet 100Mbps link cost is 1. Cost is calculated using formula:
	cost = reference bandwidth bps / interface bandwidth in bps		*<code>cost = reference bandwidth bps / interface bandwidth in bps</code>

	show interface serial 0/0/1 \| include BW !verify the current bandwidth of an interface		show interface serial 0/0/1 \| include BW !verify the current bandwidth of an interface

Pio2pio: /* Adjusting the Interface Bandwidth */

2015-03-06T19:10:39Z

Adjusting the Interface Bandwidth

← Older revision		Revision as of 21:10, 6 March 2015
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	r1(config-if)# bandwidth 64		r1(config-if)# bandwidth 64
	r1(config-if)# end		r1(config-if)# end

			Default reference bandwidth for 100Mb/s is 10^8 100.000.000 therefore Fast Ethernet 100Mbps link cost is 1. Cost is calculated using formula:
			cost = reference bandwidth bps / interface bandwidth in bps

			show interface serial 0/0/1 \| include BW !verify the current bandwidth of an interface

	= Setting up router-id =		= Setting up router-id =

Pio2pio: /* Troubleshooting */

2015-03-06T19:10:29Z

Troubleshooting

← Older revision		Revision as of 21:10, 6 March 2015
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	show ip ospf interface brief		show ip ospf interface brief
	show ip ospf interface serial 0/0/1 !cost, bandwidth		show ip ospf interface serial 0/0/1 !cost, bandwidth


	~~Default reference bandwidth for 100Mb/s is 10^8 100.000.000 therefore Fast Ethernet 100Mbps link cost is 1. Cost is calculated using formula:~~
	~~cost = reference bandwidth bps / interface bandwidth in bps~~

	show interface serial 0/0/1 \| include BW !verify the current bandwidth of an interface		show interface serial 0/0/1 \| include BW !verify the current bandwidth of an interface

Pio2pio: /* OSPFv3 router configuration for IPv6 protocol */

2015-03-06T19:08:30Z

OSPFv3 router configuration for IPv6 protocol

← Older revision		Revision as of 21:08, 6 March 2015
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	Cisco routers use IPv6 link-local addresses FE80:: to exchange LSA packets. The link-local address is automatically generated when IPv6 global unicast address is assigned to the interface. Cisco routers create the link-local address using FE80::/10 prefix and the EUI-64 process. EUI-64 involves using the 48-bit Ethernet MAC address, inserting FFFE in the middle and flipping the seventh bit. For serial interfaces, Cisco uses the MAC address of an Ethernet interface. The link local address can be assigned manually:		Cisco routers use IPv6 link-local addresses FE80:: to exchange LSA packets. The link-local address is automatically generated when IPv6 global unicast address is assigned to the interface. Cisco routers create the link-local address using FE80::/10 prefix and the EUI-64 process. EUI-64 involves using the 48-bit Ethernet MAC address, inserting FFFE in the middle and flipping the seventh bit. For serial interfaces, Cisco uses the MAC address of an Ethernet interface. The link local address can be assigned manually:
	r1(config-if)# ipv6 address fe80::1 link-local		r1(config-if)# ipv6 address fe80::1 link-local

			= OSPFv3 Troubleshooting =

	clear ipv6 ospf process		clear ipv6 ospf process

Pio2pio: /* OSPFv3 router configuration for IPv6 protocol */

2015-03-06T19:06:37Z

OSPFv3 router configuration for IPv6 protocol

← Older revision		Revision as of 21:06, 6 March 2015
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	r1(config-if)# ipv6 address fe80::1 link-local		r1(config-if)# ipv6 address fe80::1 link-local

	clear ipv6 ospf process		clear ipv6 ospf process
	show ipv6 protocols !process ID, router ID, interfaces enabled		show ipv6 protocols !process ID, router ID, interfaces enabled
	show ipv6 ospf interfaces brief		show ipv6 ospf interfaces brief
	show ipv6 ospf neighbor !FULL state means that the router and its neighbor have identical OSPF LSDBs. On multiaccess		show ipv6 ospf neighbor !FULL state means that the router and its neighbor have identical OSPF LSDBs. On multiaccess
	!networks such as Ethernet, two routers that are adjacent may have their states displayed as 2WAY.		!networks such as Ethernet, two routers that are adjacent may have their states displayed as 2WAY.
	!The dash indicates that no DR or BDR is required because of the network type.		!The dash indicates that no DR or BDR is required because of the network type.
	show ipv6 ospf interface brief !process ID, interface area, cost, state		show ipv6 ospf interface brief !process ID, interface area, cost, state
	show ipv6 ospf interface serial 0/0/1 !router ID, link cost, network type, hello and dead time timers,		show ipv6 ospf interface serial 0/0/1 !router ID, link cost, network type, hello and dead time timers,


	Enable interface to start advertising its network		Enable interface to start advertising its network

Pio2pio: /* Setting router-id */

2015-03-06T19:05:01Z

Setting router-id

← Older revision		Revision as of 21:05, 6 March 2015
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	r1(config-if)# end		r1(config-if)# end

	= Setting router-id =		= Setting up router-id =
	Router-ID (RID) is 32 bit number noted in the same way as IPv4, election process is as below:		Router-ID (RID) is 32 bit number noted in the same way as IPv4, election process is as below:
	#set by <tt>router-id</tt> command		#set by <tt>router-id</tt> command

Pio2pio: /* Setting router-id */

2015-03-06T19:04:45Z

Setting router-id

← Older revision		Revision as of 21:04, 6 March 2015
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	#if no logical/loopback IPv4 address is set then the router uses the highest IP address configured on its active interfaces		#if no logical/loopback IPv4 address is set then the router uses the highest IP address configured on its active interfaces

	Option 1 via router config		'''Option 1''' via router config
	r1(config-router)# router-id ''x.x.x.x'' !value in IPv4 format		r1(config-router)# router-id ''x.x.x.x'' !value in IPv4 format

	Option 2 via loopback interface		'''Option 2''' via loopback interface
	r1(config)# interface loopback 0		r1(config)# interface loopback 0
	r1(config-if)# ip address 1.1.1.1 255.255.255.255 !creates a host route, a 32-bit host route does not get advertised as a route to other OSPF routers		r1(config-if)# ip address 1.1.1.1 255.255.255.255 !creates a host route, a 32-bit host route does not get advertised as a route to other OSPF routers
	r1(config-if)# end		r1(config-if)# end

	Option 3 it will be the highest IPv4 active interface address in up state.		'''Option 3''' it will be the highest IPv4 active interface address in up state.

	= Differences between OSPFv2 vs OSPFv3 =		= Differences between OSPFv2 vs OSPFv3 =