Solution 1 Use New Vlan DHCP filter For

Solution 1: Use New Vlan DHCP filter For vlan 33 Vlan 34 192. 168. 33. 1 Solution 1: [1] change vlan 33 attached to SG 500 to new vlan (vlan 34) [2] SG 500 as DHCP server for vlan 34 [3] DHCP ACL filter for vlan 33 on SG 500 ip access-l ext DHCP deny udp an bootpc an bootps int vlan 33 service input DHCP default-action permit-any //filter out the DHCP request from client to this vlan, allow other packets

Solution 2: Add L 2 Switch Solution 2: [1] add a L 2 switch between router & SG 500 [2] use ACL to filter DHCP for vlan 33 in SG 500 [3] migrate all vlan 33 from SG 500 to the new L 2 switch router Vlan 50 SG 500 DHCP filter For vlan 33 Vlan 33 L 2 switch

Solution 3: Dual DHCP Server For vlan 33 192. 168. 33. 2 Router 192. 168. 33. 1 MAC: 0000. 0001 GW: SG 500 Solution 3: [1] both router and SG 500 as DHCP server for vlan 33 [2] SG 500 use DHCP host pool for vlan 33 to prevent any allocation Ip dhcp server Ip dhcp pool host 33 Add 192. 168. 33. 1 /24 hardware 0000. 0001 // MAC of router //this add will never be assigned since it’s already used by router

Suboptimal Route – SG 500 as Default Gateway PC 2 192. 168. 33. 200 GW: SG 500 ? SG 500 192. 168. 33. 2 vlan 33 192. 168. 50. 2 vlan 50 Routing Table: 0. 0/0 192. 168. 33. 1 192. 168. 33. 0/24 192. 168. 33. 2 192. 168. 50. 0/24 192. 168. 50. 2 Internet Router 0. 0/0 12. 100. 78 Router 192. 168. 33. 1 DHCP pool for vlan 33 GW: SG 500 Routing table: 0. 0/0 12. 100. 78 192. 168. 33. 0/24 192. 168. 33. 1 192. 168. 50. 0/24 192. 168. 33. 2 Solution Migrate PC 2 from Router to SG 500 PC 1 192. 168. 33. 100 GW: SG 500 ✓ PC 5 192. 168. 50. 100 GW: SG 500 ✓ PC 2 -> Internet ? Suboptimal PC 2 -> Router(L 2)-> SG 500(L 3)->Router(L 2)->Router(L 3)->I PC 2<-> PC 1 ✓ PC 2<-> Router(L 2)->SG 500(L 2)<->PC 1 PC 2 -> PC 5 ✓ PC 2 -> Router(L 2)->SG 500(L 3)->PC 5 PC 1/PC 5 -> Internet ✓ PC 1/PC 5 -> SG 500(L 3)->Router(L 2)->Router(L 3)->Internet PC 1<-> PC 5✓ PC 1<-> SG 500(L 3)<->PC 5

Suboptimal Route –Router as Default Gateway PC 2 192. 168. 33. 200 GW: Router ? SG 500 192. 168. 33. 2 vlan 33 192. 168. 50. 2 vlan 50 Routing Table: 0. 0/0 192. 168. 33. 1 192. 168. 50. 0/24 192. 168. 50. 2 192. 168. 33. 0/24 192. 168. 33. 2 Internet Router 0. 0/0 12. 100. 78 Router 192. 168. 33. 1 DHCP pool for vlan 33 GW: self Routing table: 0. 0/0 12. 100. 78 192. 168. 33. 0/24 192. 168. 33. 1 192. 168. 50. 0/24 192. 168. 33. 2 Solution SG 500 as GW PC 2 -> SG 500 PC 1 192. 168. 33. 100 GW: Router ? PC 5 192. 168. 50. 100 GW: SG 500 ✓ PC 2 -> Internet ✓ PC 2 -> Router(L 3)-> Internet PC 2 -> PC 5 ? Suboptimal PC 2 -> Router(L 3)->Router(L 2)->SG 500(L 3)->PC 5 PC 1 -> Internet ✓ PC 1 -> SG 500(L 2)->Router(L 3)->Internet PC 1 -> PC 5 ? Suboptimal PC 1 -> SG 500(L 2)->Router(L 3)->SG 500(L 3)->PC 5 -> PC 1 ✓ PC 5 -> SG 500(L 3)->PC 1 PC 5 -> Internet ✓ PC 5 -> SG 500(L 3) ->Router(L 2)->Router(L 3)->Internet