leinwand@cisco.com (Allan Leinwand) (09/27/90)
>Perhaps a picture would help: > > \ > \ ------- ------- | > | | | #1 | | | >134.40.64.0 |----| cisco |-----------| cisco |----| 134.38.192.0 > | | A | | B | | > \ ------- ------- \ > #2 | | > | / | / > ------ ------ > / | / | > | | \ > \ ------- ------- | > | | | | | | >134.40.32.0 |----| cisco |-----------| cisco |----| 134.38.128.0 > | | C | | D | | > \ ------- ------- \ > > >I have two IP networks, using class B addresses and a subnet mask of >255.255.255.192. Can I tell cisco A to route traffic from a host on >134.40.64.0 to a host on 134.38.192.0 using interface #1 and to route >traffic from a host on 134.40.64.0 to a host on 134.38.128.0 using >interface #2, (i.e., through cisco C rather than cisco B)? First, assuming that the link from A --> B is not significantly lower than all the other links in the picture, you will automatically route from A --> B using interface #1. If you want to be assured that this is the primary path taken, lower the 'bandwidth' on this link to something a little greater than the minimum bandwidth on C --> D. By looking at your picture, it seems to me that you do not want any traffic to traverse the link between cisco B and cisco D. Thus, set the 'bandwidth' metric on the interfaces on B and D (which go to the common link) to something lower than normal. Thus, the A --> C --> D route would have a lower metric. This scheme also has the advantage of not using static routes. Thus, if you link from C --> D fails, you can always use the A --> B --> D link as backup. Maybe something like this: 64 A --------------- B 56| |32 | | C ---------------- D 56 Even if your real bandwidth does not match these 'bandiwdth' settings, this should produce the desired routing. Thanks, Allan Leinwand cisco Systems
allan@frisbee.cisco.com (Allan Leinwand) (09/28/90)
>Perhaps a picture would help: > > \ > \ ------- ------- | > | | | #1 | | | >134.40.64.0 |----| cisco |-----------| cisco |----| 134.38.192.0 > | | A | | B | | > \ ------- ------- \ > #2 | | > | / | / > ------ ------ > / | / | > | | \ > \ ------- ------- | > | | | | | | >134.40.32.0 |----| cisco |-----------| cisco |----| 134.38.128.0 > | | C | | D | | > \ ------- ------- \ > > >I have two IP networks, using class B addresses and a subnet mask of >255.255.255.192. Can I tell cisco A to route traffic from a host on >134.40.64.0 to a host on 134.38.192.0 using interface #1 and to route >traffic from a host on 134.40.64.0 to a host on 134.38.128.0 using >interface #2, (i.e., through cisco C rather than cisco B)? First, assuming that the link from A --> B is not significantly lower than all the other links in the picture, you will automatically route from A --> B using interface #1. If you want to be assured that this is the primary path taken, lower the 'bandwidth' on this link to something a little greater than the minimum bandwidth on C --> D. By looking at your picture, it seems to me that you do not want any traffic to traverse the link between cisco B and cisco D. Thus, set the 'bandwidth' metric on the interfaces on B and D (which go to the common link) to something lower than normal. Thus, the A --> C --> D route would have a lower metric. This scheme also has the advantage of not using static routes. Thus, if you link from C --> D fails, you can always use the A --> B --> D link as backup. Maybe something like this: 64 A --------------- B 56| |32 | | C ---------------- D 56 Even if your real bandwidth does not match these 'bandwidth' settings, this should produce the desired routing. Thanks, Allan Leinwand cisco Systems