Here’s a handy list of ACL entries to allow your devices to speak routing protocols, availability protocols, and some other stuff. We’ll assume you have ACL 101 applied to your Ethernet inbound; your Ethernet has an IP of 192.168.0.1.
BGP : Runs on TCP/179 between the neighbors
access-list 101 permit tcp any host 192.168.0.1 eq 179
EIGRP : Runs on its own protocol number from the source interface IP to the multicast address of 224.0.0.10
access-list 101 permit eigrp any host 224.0.0.10
OSPF : Runs on its own protocol number from the source interface IP to the multicast address of 224.0.0.5; also talks to 224.0.0.6 for DR/BDR routers
access-list 101 permit ospf any host 224.0.0.5
access-list 101 permit ospf any host 224.0.0.6
HSRP : Runs on UDP from the source interface IP to the multicast address of 224.0.0.2. I’ve seen in the past that it runs on UDP/1985, but I didn’t find any evidence of that in a quick Google for it. Can someone verify?
access-list 101 permit udp any host 224.0.0.2
RIP : Runs on UDP/520 from the source interface IP to the multicast address of 224.0.0.9
access-list 101 permit udp any host 224.0.0.9 eq 520
VRRP : Runs on its own protocol number from the source interface IP to the multicast address of 224.0.0.18
access-list 101 permit 112 any host 224.0.0.18
GLBP : Runs on UDP from the source interface IP to the multicast address of 224.0.0.102
access-list 101 permit udp any host 224.0.0.102
DHCPD (or bootps) : Runs on UDP/67 from 0.0.0.0 (since the client doesn’t have an address yet) to 255.255.255.255 (the broadcast).
access-list 101 permit udp any host 255.255.255.255 eq 67
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