so what i can understand from above is that, what ever statements are there set... all of those should match to have an action. But set ip default next-hope is kinda fail safe option, if nothing else work it should work.
Best regards, Nadeem Rafi On Mon, Jan 25, 2010 at 12:03 AM, Joe Astorino <[email protected]>wrote: > Because the two set commands are looking at different values: The > first two you mention (set ip next-hop and set ip next-hop > verify-availability make their decisions based on a) if the next-hop > you specify is in your routing table and b) if it is verified via CDP. > > The third set command (set ip default next-hop) looks at something > different entirely -- It looks at the destination IP address. If you > don't have a route for the destination, it will policy route to the > next-hop that you set. The set ip default next-hop command is sort of > like having a static route ONLY for the things that matched the > access-list. > > On Sun, Jan 24, 2010 at 3:54 PM, Nadeem Rafi <[email protected]> wrote: > > i am sorry if i cannot elaborate my question. I will try again... > > with match statement things will proceed to set commands. > > set ip next hope ABC > > will set next hop to ABC but only if > > set ip next-hope verify-availability > > CDP can verify that next hope is available. if its not available then set > > command will not do any thing and will not set it to ABC. > > quite clear upto this point. > > BUT why logic take care of following? Why it should not skip it also? > that > > was what i want to ask :) > > set ip default next-hope XYZ > > > > Best Regards, > > Nadeem Rafi > > On Sun, Jan 24, 2010 at 11:46 PM, Joe Astorino <[email protected]> > > wrote: > >> > >> I'm not sure I understand the question entirely, but there are > >> fundamental differences in the commands here: > >> > >> 1) set ip next-hop <--- This will look at the next-hop address you > >> specify. If that next-hop is in the routing-table, the packet is > >> policy routed to that next-hop. > >> 2) set ip default next-hop <--- This will look at the destination IP > >> address in the header. If you have a route to the destination in your > >> routing table the packet is NOT policy routed. If you don't have a > >> route to the destination, then you are routed to the next-hop > >> specified. > >> > >> The logic is different, and the two commands are looking at different > >> fields. The first looks at next-hop and the second looks at the > >> destination IP address to make decisions. > >> > >> HTH > >> > >> On Sun, Jan 24, 2010 at 1:32 PM, Nadeem Rafi <[email protected]> wrote: > >> > Route-map Policy_routing > >> > match ip address FROM_X_TO_Y permit 10 > >> > set ip next hope ABC > >> > set ip next-hope verify-availability > >> > set ip default next-hope XYZ > >> > how this will work? I know if cdp cannot verify reachability of next > >> > hope then set ip next-hope ABC will not work. But why set ip default > >> > will > >> > work? > >> > Sorry for such basic question... > >> > Best Regards, > >> > Nadeem rafi > >> > _______________________________________________ > >> > For more information regarding industry leading CCIE Lab training, > >> > please > >> > visit www.ipexpert.com > >> > > >> > > >> > >> > >> > >> -- > >> Regards, > >> > >> Joe Astorino CCIE #24347 (R&S) > >> Sr. Technical Instructor - IPexpert > >> Mailto: [email protected] > >> Telephone: +1.810.326.1444 > >> Live Assistance, Please visit: www.ipexpert.com/chat > >> eFax: +1.810.454.0130 > >> > >> IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA > >> (R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, > >> Security & Service Provider) Certification Training with locations > >> throughout the United States, Europe and Australia. Be sure to check > >> out our online communities at www.ipexpert.com/communities and our > >> public website at www.ipexpert.com > > > > > > > > -- > Regards, > > Joe Astorino CCIE #24347 (R&S) > Sr. Technical Instructor - IPexpert > Mailto: [email protected] > Telephone: +1.810.326.1444 > Live Assistance, Please visit: www.ipexpert.com/chat > eFax: +1.810.454.0130 > > IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA > (R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice, > Security & Service Provider) Certification Training with locations > throughout the United States, Europe and Australia. Be sure to check > out our online communities at www.ipexpert.com/communities and our > public website at www.ipexpert.com >
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