Hi All,
Please note, here, by "port", I mean logical interface.
I was wondering how should the secondary ipv4 address on a "port" function?
Please correct me if I am wrong, anywhere.
Questions:
1. Should we have connected routes for the secondary IPv4 addresses' subnet as
like Primary ip address' subnet?
2. Is it necessary for "Port" on the peer should also have the similarly
presence in more than one subnets?
3. Does it mean based on the nexthop ip address the source Ip address of the
originating packets will be picked up?
4. Shall we run routing on the secondary ip addresses' subnets? Like, OSPF.
5. Does BGP bother about this secondary Ip addresses, I mean can it peer on
this secondary IP addresses?
Please advise on above questions.
Below are some sample behaviors-
Behavior on some NOSes -
1. Allow a primary and multiple secondary Ipv4 addresses on a "Port".
2. OSPF will advertise a secondary subnetwork only if it is also running on the
primary subnetwork.
3. Secondary networks are considered STUB network and hence NO Hellos are sent
on them. Hence, no adjacencies can be established on secondary networks.
Quagga's behavior -
1. Quagga doen't have specific commands to configure an ip address as primary
or secondary.
Logic from code looks like -
2. First ip address configured on an "Port" is Primay. All subsequent ip
address configurations on the same "Port" are secondary. Doesn't seem to be
deterministic behavior.
3. If the primary address is being deleted, the next one in the list is
promoted to "primary".
4. OSPF will run on only primary ip address's subnet.
But not seeing this happening. We may need to debug. Or I am getting it wrong.
As a result multiple ip addresses are configured as Primary, and so able run
OSPF on all of their subnets.
root@hq1:/# vtysh
Hello, this is Quagga (version 0.99.22.4).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
hq1# sh running-config
Building configuration...
Current configuration:
!
hostname Router
hostname bgpd
log stdout
!
password zebra
enable password zebra
!
interface eth0
ip address 10.10.10.1/24
ip address 11.10.10.1/24
ipv6 nd suppress-ra
!
interface lo
!
router ospf
ospf router-id 1.1.1.1
network 10.0.0.0/8 area 0.0.0.100
network 11.0.0.0/8 area 0.0.0.101
!
ip forwarding
!
line vty
!
end
hq1#
hq1# sh int eth0
Interface eth0 is up, line protocol detection is disabled
index 136 metric 1 mtu 1500
flags: <UP,BROADCAST,RUNNING>
HWaddr: 02:42:ac:11:00:0e
inet 10.10.10.1/24 broadcast 10.10.10.255
inet 11.10.10.1/24 broadcast 11.10.10.255
inet 172.17.0.14/16
inet6 fe80::42:acff:fe11:e/64
hq1#
hq1# sh ip os ne
Neighbor ID Pri State Dead Time Address Interface
RXmtL RqstL DBsmL
2.2.2.2 1 Full/DR 37.761s 10.10.10.2 eth0:10.10.10.1
0 0 0
2.2.2.2 1 Full/DR 38.589s 11.10.10.2 eth0:11.10.10.1
0 0 0 hq1# hq1# sh ip os int eth0
eth0 is up
ifindex 136, MTU 1500 bytes, BW 0 Kbit <UP,BROADCAST,RUNNING>
Internet Address 10.10.10.1/24, Broadcast 10.10.10.255, Area 0.0.0.100
MTU mismatch detection:enabled
Router ID 1.1.1.1, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State Backup, Priority 1
Designated Router (ID) 2.2.2.2, Interface Address 10.10.10.2
Backup Designated Router (ID) 1.1.1.1, Interface Address 10.10.10.1
Multicast group memberships: OSPFAllRouters OSPFDesignatedRouters
Timer intervals configured, Hello 10s, Dead 40s, Wait 40s, Retransmit 5
Hello due in 4.893s
Neighbor Count is 1, Adjacent neighbor count is 1
Internet Address 11.10.10.1/24, Broadcast 11.10.10.255, Area 0.0.0.101
MTU mismatch detection:enabled
Router ID 1.1.1.1, Network Type BROADCAST, Cost: 10
Transmit Delay is 1 sec, State Backup, Priority 1
Designated Router (ID) 2.2.2.2, Interface Address 11.10.10.2
Backup Designated Router (ID) 1.1.1.1, Interface Address 11.10.10.1
Multicast group memberships: OSPFAllRouters OSPFDesignatedRouters
Timer intervals configured, Hello 10s, Dead 40s, Wait 40s, Retransmit 5
Hello due in 7.933s
Neighbor Count is 1, Adjacent neighbor count is 1 hq1#
Thanks,
Naeem
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