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intervlan com. prob in an imperfect network

srikanth ath
Level 4
Level 4

HI all

on switchA there is a server 10.10.5.10/24 which should be accessed by  all vlan users ex. wifi, vlan 1

here is my network description:

switch A, B : L2 switches

switch A has two vlans for VOIP vlan 25:- 10.10.5.0/24 and vlan 26 10.10.6.0/24

switch B has few clients running on vlan 1: 10.10.11.0/24

  switch  C : L3 switch  has two VLans for WIfi 10.10.1.0/24 and 10.10.2.0/24

  switch C not directly connected  to firewall as switch b is in between, but this switch will route all the traffic to firewall by default route to forwarding address 10.10.11.1 of firewall/                        

switch A------------switch C--<int fa 0/24:10.10.11.254/24>------------switchB (vlan1)--------------------<int 10.10.11.1/24>----Firewall

    |                         |                                                                                       |

    |                        WIFI                                                                                  |

router                                                                                     few clients conneted to this switchall on vlan1

    |                                                                                          gateway for users is 10.10.11.1

     |

    |

    |

internet

so on switchA there is a server 10.10.5.10/24 which should be accessed by  all vlan users ex. wifi, vlan 1

Note : from Wifi vlan they connect to server 10.10.5.1,  but not from vlan 1.

as L3 switch has an ip address for int fa 0/24 as 10.10.11.254/24 ------we cannot assign an ip address for vlan 1 in the same switch/

as vlan 1

ip address 10.10.10.11.X

overlaps with int fa 0/24

how should i make this acheiev vlan 1 should be able to communicate with server.

i know this is the strange network set up, but this is how it is. cant change anything

1) router has the vlan1 encapsulated trunk sub interface  with ip 10.10.11.253

2) switch A has the vlan1 ip address as 10.10.11.252

3) from switchA i can ping to 10.10.11.253(router ip) as source 10.10.11.252

4) but from switch A i couldnt ping to 10.10.11.254 ip of switchC (L3 switch)

regards

srikanth

2 Replies 2

srikanth ath
Level 4
Level 4

Hi canyone help me on this

HI i have self debugged this issue.

1. trunked switch A and B :

2. in switch A i had a SVI interface for vlan 1 as the same i have done in the router.

3. gave a route in the router

ip route 10.10.11.0 255.255.255.0 gigabit ethernet 0/0.

and now i can ping to firewall gateway, L3 switch access port and VLAn 1 clients from router .

just thinking it wil be useful to some one im updating this.

Thanks

srikanth

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