Lab 10-4: BGP with GateD
Now we replace the Zebra daemons on callisto and castor with GateD (see Examples 10-19 and 10-20). The secondary interface connecting callisto and ganymed is disabled, and OSPF authentication is turned off to accommodate GateD restrictions.
Although GateD lacks some of the features of Zebra, the configuration tries to mimic the Zebra configurations (Examples 10-11 to 10-13) as closely as possible. GateD uses different group <type> peeras types to configure peerings (<type>=external, IGP, internal, routing) that can be used to configure IBGP and EBGP scenarios. For a more detailed explanation, refer to the V3.6 documentation.
NOTE
Note that the highlighted export statement in Example 10-19 is used to accomplish IBGP route reflector behavior.
Example 10-19. Castor GateD Route Reflector Setup
[root@castor:~#] cat /etc/gated.cfg routerid 192.168.2.7; autonomoussystem 65000; rip off; ospf yes{ backbone{ networks{ 192.168.2.0 mask 255.255.255.0; 192.168.80.0 mask 255.255.255.0; 192.168.99.0 mask 255.255.255.252; }; interface xl0 vlan8 wpachdlc0; }; }; bgp yes{ group type routing peeras 65000 proto ospf { peer 192.168.1.1; }; group type external peeras 65003 { peer 192.168.7.254; }; }; static{ default gateway 192.168.2.254; }; #exporting to OSPF export proto ospfase{ proto static{all; }; proto direct{all; }; }; export proto bgp as 65000 { proto bgp as 65000 {all;}; # for reflection proto ospf{all;}; }; export proto bgp as 65003 { proto ospf{all;}; }; GateD-castor> show bgp sum 100 Neighbor V AS MsgRcvd MsgSent State 100 192.168.1.1 4 65000 3 4 Established 100 192.168.7.254 4 65003 5 4 Established 100 BGP summary, 2 groups, 2 peers. GateD-castor> show bgp routes 0/0 100 Proto Route/Mask NextHop MED ASPath 100 BGP 10/24 192.168.7.254 0 (65000) 65003 IGP (Id 5) 100 BGP 10.0.1/24 192.168.7.254 0 (65000) 65003 IGP (Id 5) 100 BGP 172.16/25 192.168.7.254 -1 (65000) 65003 65001 IGP (Id 4) 100 BGP 172.16.0.128/25 192.168.7.254 -1 (65000) 65003 65001 IGP (Id 4) GateD-castor> show ip walkdown 0/0 100 Ker 0.0.0.0/0 192.168.2.254 IGP (Id 1) 100 BGP 10/24 192.168.7.254 (65000) 65003 IGP (Id 5) 100 BGP 10.0.1/24 192.168.7.254 (65000) 65003 IGP (Id 5) 100 Sta 127/8 127.0.0.1 IGP (Id 1) 100 Dir 127.0.0.1/32 127.0.0.1 IGP (Id 1) 100 BGP 172.16/25 192.168.7.254 (65000) 65003 65001 IGP (Id 4) 100 BGP 172.16.0.128/25 192.168.7.254 (65000) 65003 65001 IGP (Id 4) 100 OSP 192.168.1/24 192.168.2.254 (65000) IGP (Id 2) 100 Ker 192.168.1.1/32 192.168.2.254 IGP (Id 1) 100 Ker 192.168.1.2/32 192.168.2.254 IGP (Id 1) 100 Dir 192.168.2/24 192.168.2.7 IGP (Id 1) 100 Dir 192.168.7/24 192.168.7.7 IGP (Id 1) 100 OSP 192.168.14/24 192.168.2.254 (65000) Incomplete (Id 3) 100 OSP 192.168.44/24 192.168.2.254 (65000) Incomplete (Id 3) 100 Dir 192.168.80/24 192.168.80.1 IGP (Id 1) 100 Dir 192.168.99.1/32 127.0.0.1 IGP (Id 1) 100 Dir 192.168.99.2/32 192.168.99.1 IGP (Id 1) 100 OSP 211.11.117/24 192.168.2.254 (65000) Incomplete (Id 3) GateD-castor> show bgp peeras 65003 100 group type External AS 65003 local 65000 flags <> 100 peer 192.168.7.254 version 4 lcladdr (null) gateway (null) 100 flags 0x0 100 state 0x6 <Established> 100 options 0x0 <> 100 metric_out -1 100 preference 170 100 preference2 0 100 recv buffer size 0 100 send buffer size 0 100 messages in 24 (updates 3, not updates 21) 559 octets messages out 23 (updates 1, not updates 22) 473 octets [root@castor:~#] netstat -rn -f inet Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 192.168.2.254 UGSc 1 62 xl0 10/24 192.168.7.254 UGc 0 0 ed0 10.0.1/24 192.168.7.254 UGc 0 0 ed0 127 127.0.0.1 URc 0 0 lo0 127.0.0.1 127.0.0.1 UH 2 186 lo0 172.16/25 192.168.7.254 UGc 0 0 ed0 172.16.0.128/25 192.168.7.254 UGc 0 0 ed0 192.168.1 192.168.2.254 UGc 2 2 xl0 192.168.2 link#1 UC 1 0 xl0 192.168.2.254 52:54:05:e3:e4:2f UHLW 7 0 xl0 337 192.168.7 link#2 UC 1 0 ed0 192.168.7.254 00:00:0c:1a:a9:a8 UHLW 7 67 ed0 347 192.168.14 192.168.2.254 UGc 0 0 xl0 192.168.44 192.168.2.254 UGc 0 3 xl0 192.168.80 link#15 UC 0 0 vlan8 192.168.99.1 127.0.0.1 UGH 0 0 lo0 192.168.99.2 192.168.99.1 UH 0 3 wpachd 211.11.117 192.168.2.254 UGc 0 0 xl0 224.0.0.5 127.0.0.1 UH 0 0 lo0 224.0.0.6 127.0.0.1 UH 0 0 lo0
Example 10-20. Callisto GateD Setup
[root@callisto:~#] cat /etc/gated.conf routerid 192.168.1.1; autonomoussystem 65000; rip off; ospf yes{ backbone{ networks{ 192.168.1.0 mask 255.255.255.0; 192.168.99.0 mask 255.255.255.252; 192.168.45.0 mask 255.255.255.0; }; interface eth1 wp1chdlc; }; }; bgp yes{ group type routing peeras 65000 proto ospf { peer 192.168.44.1; peer 192.168.2.7; }; group type external peeras 65001 { peer 192.168.14.2; }; group type external peeras 65003 { peer 192.168.14.254; }; }; static{ default gateway 192.168.1.254; }; #exporting to OSPF export proto ospfase{ #restrict; proto static{all; }; proto direct{all; }; #proto kernel{all; }; }; export proto bgp as 65000 { proto bgp as 65000 {all;}; # for reflection proto ospf{all;}; }; export proto bgp as 65001 { proto ospf{all;}; }; export proto bgp as 65003 { proto ospf{all;}; }; GateD-callisto> show bgp sum 100 Neighbor V AS MsgRcvd MsgSent State 100 192.168.44.1 4 65000 90 96 Established 100 192.168.2.7 4 65000 27 29 Established 100 192.168.14.2 4 65001 103 98 Established 100 192.168.14.254 4 65003 108 98 Established 100 BGP summary, 3 groups, 4 peers. GateD-callisto> show bgp routes 0/0 100 Proto Route/Mask NextHop MED ASPath 100 BGP 10/24 192.168.14.254 0 (65000) 65003 IGP (Id 7) 100 BGP 10.0.1/24 192.168.14.254 0 (65000) 65003 IGP (Id 7) 100 BGP 172.16/25 192.168.14.2 0 (65000) 65001 IGP (Id 5) 100 BGP 172.16.0.128/25 192.168.14.2 0 (65000) 65001 IGP (Id 5) GateD-callisto> show ip walkdown 0/0 100 Sta 0.0.0.0/0 192.168.1.254 IGP (Id 1) 100 BGP 10/24 192.168.14.254 (65000) 65003 IGP (Id 7) 100 BGP 10.0.1/24 192.168.14.254 (65000) 65003 IGP (Id 7) 100 Sta 127/8 127.0.0.1 IGP (Id 1) 100 Dir 127.0.0.1/32 127.0.0.1 IGP (Id 1) 100 BGP 172.16/25 192.168.14.2 (65000) 65001 IGP (Id 5) 100 BGP 172.16.0.128/25 192.168.14.2 (65000) 65001 IGP (Id 5) 100 Dir 192.168.1/24 192.168.1.1 IGP (Id 1) 100 OSP 192.168.2/24 192.168.1.254 (65000) IGP (Id 8) 100 OSP 192.168.7/24 192.168.1.254 (65000) IGP (Id 8) 100 Dir 192.168.14/24 192.168.14.1 IGP (Id 1) 100 OSP 192.168.44/24 192.168.1.254 (65000) Incomplete (Id 3) 100 OSP 192.168.80/24 192.168.1.254 (65000) IGP (Id 8) 100 Dir 192.168.99/32 192.168.99.2 IGP (Id 1) 100 Dir 192.168.99.2/32 127.0.0.1 IGP (Id 1) 100 OSP 211.11.117/24 192.168.1.254 (65000) Incomplete (Id 3) [root@callisto:~#] netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 224.0.0.6 127.0.0.1 255.255.255.255 UGH 40 0 0 lo 224.0.0.5 127.0.0.1 255.255.255.255 UGH 40 0 0 lo 192.168.99.0 0.0.0.0 255.255.255.255 UH 40 0 0 wp1chdlc 192.168.99.2 127.0.0.1 255.255.255.255 UGH 40 0 0 lo 127.0.0.1 0.0.0.0 255.255.255.255 UH 40 0 0 lo 192.168.99.0 0.0.0.0 255.255.255.252 U 40 0 0 wp1chdlc 172.16.0.128 192.168.14.2 255.255.255.128 UG 40 0 0 eth0 172.16.0.0 192.168.14.2 255.255.255.128 UG 40 0 0 eth0 192.168.7.0 192.168.1.254 255.255.255.0 UG 40 0 0 eth1 211.11.117.0 192.168.1.254 255.255.255.0 UG 40 0 0 eth1 10.0.0.0 192.168.14.254 255.255.255.0 UG 40 0 0 eth0 10.0.1.0 192.168.14.254 255.255.255.0 UG 40 0 0 eth0 192.168.2.0 192.168.1.254 255.255.255.0 UG 40 0 0 eth1 192.168.80.0 192.168.1.254 255.255.255.0 UG 40 0 0 eth1 192.168.1.0 0.0.0.0 255.255.255.0 U 40 0 0 eth1 192.168.14.0 0.0.0.0 255.255.255.0 U 40 0 0 eth0 192.168.44.0 192.168.1.254 255.255.255.0 UG 40 0 0 eth1 127.0.0.0 - 255.0.0.0 ! - - - - 0.0.0.0 192.168.1.254 0.0.0.0 UG 40 0 0 eth1
