hi bryan,
>From the link you sent as below I undetstood that for ebgp session ttl value is 254.Is that right? I have read /listened somewhere else it is for ibgp and for ebgp is default one 1. And for the below example what exactly ebgp multihop 1 means?Is not it 1 by default? Defaults A BGP routing process will verify the connection of single-hop eBGP peering session (*TTL=254)* to determine if the eBGP peer is directly connected to the same network segment by default. If the peer is not directly connected to same network segment, connection verification will prevent the peering session from being established. Examples In the following example, a single-hop eBGP peering session is configured between two BGP peers that are reachable on the same network segment through a local loopback interfaces on each router: BGP Peer 1 Router(config)# interface loopback 1 Router(config-if)# ip address 10.0.0.100 255.255.255 Router(config-if)# exit Router(config)# router bgp 64512 Router(config-router)# neighbor 192.168.0.200 remote-as 65534 Router(config-router)# neighbor 192.168.0.200 ebgp-multihop 1 Router(config-router)# neighbor 192.168.0.200 update-source loopback 2 Router(config-router)# neighbor 192.168.0.200 disable-connected-check Router(config-router)# end BGP Peer 2 Router(config)# interface loopback 2 Router(config-if)# ip address 192.168.0.200 255.255.255 Router(config-if)# exit Router(config)# router bgp 65534 Router(config-router)# neighbor 10.0.0.100 remote-as 64512 Router(config-router)# neighbor 10.0.0.100 ebgp-multihop 1 Router(config-router)# neighbor 10.0.0.100 update-source loopback 1 Router(config-router)# neighbor 10.0.0.100 disable-connected-check Router(config-router)# end On Tue, Mar 16, 2010 at 9:16 PM, Bryan Bartik <[email protected]> wrote: > Mustafa, > > It's in the command reference how it does this. It simply disables the > check: > > > http://www.cisco.com/en/US/docs/ios/12_3t/ip_route/command/reference/ip2_n1gt.html#wp1109875 > > On Tue, Mar 16, 2010 at 12:49 PM, Mustafa Yadav > <[email protected]>wrote: > >> hi all, >> >> So far I know for e-bgp ttl is always 1 and if you wanna to establish bgp >> between loopbacks you have to use ebgp multihop command.But today I have >> learned disable-connected check is also helps to establish betwwen >> looopbacks.How is it helping on this?Chaning ttl values or what? >> >> >> >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> >> > > > -- > Bryan Bartik > CCIE #23707 (R&S, SP), CCNP > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
