Maximum Dynamic IP Routing Processes on Cisco

The Cisco IOS software can handle simultaneous operation of up to 30 dynamic IP routing
processes. The combination of routing processes on a router or access server consists of the following protocols
(with the limits noted) :

~ up to 30 IGRP or EIGRP routing processes
~ up to 30 OSPF routing processes
~ one RIP routing process
~ one IS-IS process
~ one BGP routing process

Well, let we test

R(config)#do sh ip proto sum            
Index Process Name
0     connected
1     static
2     rip
3     bgp 65500
4     eigrp 1
5     eigrp 2
6     eigrp 3
7     eigrp 4
8     eigrp 5
9     eigrp 6
10    eigrp 7
11    eigrp 8
12    eigrp 9
13    eigrp 10
14    eigrp 11
15    eigrp 12
16    eigrp 100
17    eigrp 200
18    eigrp 300
19    eigrp 400
20    eigrp 500
21    eigrp 600
22    eigrp 700
23    eigrp 800
24    eigrp 900
25    eigrp 1000
26    ospf 1
27    ospf 2
28    ospf 3
29    ospf 4
30    ospf 5
31    ospf 6
0     ospf 111

R(config)#router ospf 222
too many IP routing processes

R(config)#router eigrp 222
too many IP routing processes

R(config)#router bgp 100
BGP is already running; AS is 65500

All of IP routing processes in a router include connected and static is 33, without connected and static is 31 routing processes, So 31 dynamic routing processes can running concurrent (connected and static is static routing processes). But we need concern don't push a router running many of routing process very depend on memory of router futhermore advertise many of prefix.