passive interface combined with network ( for EIGRP) and with network .. area ( for OSPF) allow to advertise the IP subnet associated to the involved interface as an internal route ( for EIGRP and for OSPF) without building neighborships on it.
A typical example is a campus network with 20 client vlans - 20 IP subnets served by two multilayer switches SW1 and SW2.
The IP subnets associated to these client vlans have to be advertised in the IGP in order to allow return traffic to client PCs from everywhere.
If we simply use the network ( for EIGRP) or network area command ( for OSPF) we achieve the advertisement but the price to pay is that SW1 and SW2 become neighbors in all 20 client Vlans. This is clearly a waste of resources as SW1 and SW2 are already interconnected by other means.
An alternative could be the use of redistribute connected eventually with a route filter implemented with a route-map.
However, redistributing connected creates external routes and this is specially important with OSPF: external routes are placed into LSA 5 type 2 or type 1 and they cannot be filtered at area boundary.
Hi!Need to find network devices but not want to open SSH and do show cdp nei, show lldp nei and then need to sh cdp nei gig0/1 det and more.... ?Now You can do from PowerShell.\cdplldp.exe -v v3 -u <SNMPv3 user> -a SHA -w <SNMPv3 authkey> -pp ...
Community Live slides- Getting to know Cisco SD-WAN
(Live event - formerly known as Webcast- Wednesday December 11, 2019 at 10 am Pacific/ 1 pm Eastern / 7 pm Paris)
This event had place on Wednesday 11th, December 2019 at 10hrs PDT
To participate in this event, please use the button to ask your questions
This topic is a chance to clarify your questions about the Cisco Software-Defined WAN (SD-WAN) solution, its historical roo...
Starting from NFVIS 3.12 versions, the deploy option does not depict all the SR-IOV VFs(Virtual Functions) available in a physical interface. This change is introduced as (i) the number of VFs of ENCS platform on LANs side is increased to 24 and (ii) the...