Routing

Why a new protocol such as BFD is required to detect subsecond failures within routing domains and HSRP setup? Why couldn't the implementation in IOS of existing protocols such as HSRP, EIGRP, BGP and OSPF be modified to allow new subsecond hold or d...

Hi, I am designing a network, protocol used OSPF. Attached is the diagram. My query is 1) On site A I have two network behind a l3 switch 172.16.x.x and 172.26.x.x in area 3.3.3.3 2) On Site B I have two network behind a l3 switch 172.30.x.x and 172...

Please explain what is the difference between Via, From and Contact header in SIP INVITE and they these headers contain redundant information? Please don't give reference to RFC3261 because I have already read that but it didn't help!! From Header  ...

What exactly does the thermistor module in a 7600 series router?  Is it a mandatory part, or can the router work without it? Thank you.

Hi all, I have 2 mpls circuits each connected to a router meant for my local area network's outgoing traffic. I like to configure my pair of routers in a active-standby kind of HA, where all incoming/outgoing traffic will go through my primary router...

We have a scenario where R1 running ebgp is connected to different BGP Peers via fa0/1 & fa0/2. Now my goal is to mark all traffic flowing through fa0/2 with a DSCP mark of 36 for both incoming & outgoing traffic and convey this marking to port fa0/3...

Does IOS up-gradation requires the router/switch to configure again or old configuration exists ?  

Hi All, I have a lab and re distributing OSPF from VRF "10" to BGP. Routers in between(R1 to R2 to R3) run iBGP with VPN4 . the ospf gets to the other end (R3) with next hop of R1 BGP loopback address. when redistributing this back to ospf on R3, ...

we have 4 data centers, 4 data center core switches connected to each other using point-to-point trunk link. all these 4 data centers core switches are in area 0.  there are other sites connected to these data centers through edge router at data cent...

Hello, So here's something I cannot figure out.  I need to block the advertisement of only the default route 0.0.0.0/0 to neighbors on area 0.0.0.0 from Remote Site 2.  If you take a look at the topology I have a main site that is used for the two re...

Hello, I bought a Router 1941 and got the security lic.  I am new to cisco products and don't have any training but started reading up on it and I learn fast.  However I need to deploy this router in my work environment fast and I just don't have th...

HiShort description: why does ios select null route w/ distance 230 as active path instead of route learned from iBGP?Normally R1's active route is static route via fa2/0ip route 192.168.4.0/23 255.255.254.0 FastEthernet2/0 192.168.4.6R1#sh ip route ...