Switching
- beware of pruning issues when some switches are transparent and some aren’t. If not otherwise specified, make all switches transparent if one is.
IP Telephony
macro apply cisco-phone $access_vlan 5 $voice_vlan 4sets most things properly- To change the CoS applied to traffic coming from the PC connected to a phone:
switchport priority extend cos 1 - Don’t forget to enable
mls qosglobally or nothing will work
PPP
- as a general rule, use
no peer neighbor-routeon all PPP interfaces to avoid random /32 routes showing up in IGPs and redistributions. They’re only needed if you have different subnets at each end of the link.
IGP’s — RIP
- use the
distribute-list gatewayoption along with a prefix-list to specify the routers from which we will accept routes. - don’t forget the
prefixoption (e.g.distribute-list prefix FOOnotdistribute-list FOOwhen filtering routing updates - remember, though, that a
distribute-listdoesn’t have to use aprefix-list. It also works just fine with a regular ACL (useful forpermit anyordeny any).
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