Amer.com SS3GR50i Configuration Manual

Text of Amer.com SS3GR50i User Guide:

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 64 Chapter 7 Port Channel Configuration 7.1 Introduction to Port Channel To understand Port Channel, Port Group should be introduced first. Port Group is a group of physical ports in the configuration level; only physical ports in the Port Group can take part in link aggregation and become a member port of a Port Channel. Logically, Port Group is not a port but a port sequence. Under certain conditions, physical ports in a Port Group perform port aggregation to form a Port Channel that has all the properties of a logical port, therefore it becomes an independent logical port. Port aggregation is a process of logical abstraction

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 146 If the state of a port is showed as not closed when using “show anti-arpscan”, it means that the port is not closed by the ARP scanning prevention function. If the port is closed by other modules, users can check it with “show interface”. The max number of IP that can be disabled by IP-based ARP scanning prevention is 64. If the limit is exceeded, users will see a prompt. Other modules can also disable IP, since the max number of IP that can be

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 183 set as-path prepend <as-num> no set as-path prepend [<as-num>] Add a specified AS No. before the BGP routing messages as-path series; The no set as-path prepend [<as-num>] command deletes the configuration set atomic-aggregate no set atomic-aggregate Configure the BGP atomic aggregate property; The no set atomic-aggregate command deletes the configuration set comm-list <community-list-name | community-list-num > delete no set comm-list <community-list-name | community-list-num > delete Delete

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 246 timers bgp <keep alive> <holdtime> no timers bgp Configure the BGP timers of all the neighbors; the no timers bgp command recovers the default value. （2） Configure the timer value of a particular neighbor Command Explanation BGP configuration mode neighbor { <ip-address> | <TAG> } timers <keep alive> <holdtime> no neighbor { <ip-address> | <TAG> } timers Configure the keep alive and holdtime timer of a particular neighbor; the no neighbor { <ip-address> | <TAG> } timers command recovers the default value. 9．Adjust BGP announcem

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 106 Fig 1-5 The Topology Of the Instance 4 after the MSTP Calculation 11.4 MSTP Troubleshooting z In order to run the MSTP on the switch port, the MSTP has to be enabled globally. If the MSTP is not enabled globally, it can’t be enabled on the port. z The MSTP parameters co work with each other, so the parameters should meet the following conditions. Otherwise, the MSTP may work incorrectly. 2×(Bridge_Forward_Delay -1.0 seconds) >= Bridge_Max_Age Bridge_Max_A

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 193 Router and address family configuration mode network <A.B.C.D/M | ifname|vlan> no network <A.B.C.D/M | ifname|vlan> Enables the segment running RIP protocol; the no network <A.B.C.D/M | ifname|vlan> command deletes the segment. 2. Configure RIP protocol parameters （1）Configure RIP packet transmitting mechanism 1）Configure the RIP data packet point-transmitting 2）Configure the Rip broadcast Command Explanation Route

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 191 advertise the update packets immediately, regardless of the 30 second update timer status. There two versions of RIP, version 1 and version 2. RFC1058 introduces RIP-I protocol, RFC2453 introduces RIP-II, which is compatible with RFC1723 and RFC1388. RIP-I updates packets by packets broadcast, subnet mask and authentication is not supported. Some fields in the RIP-I packets are not used and are required to be all 0’s; for this reason, such all 0's fields should be checked when using RIP-I, the RIP-I packets should be discarded if such fields are non-zero. RIP-II is

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 208 5) Each neighboring layer3 switch copies the LSA packet and passes it to the next neighbor (i.e. flooding). 6) Since routing database is not recalculated before layer3 switch forwards LSA flooding, the converging time is greatly reduced. One major advantage of link-state routing protocols is the fact that infinite counting is impossible, this is because of the way link-state routing protocols build up their routing table. The second advantage is that converging in a link-state interconnected network is very fast, once the routing topology changes, updates will be flooded throughout the network very soon. Those advantages release some lay

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 229 IPv6 ospf cost <cost> [instance-id <id>] no IPv6 ospf cost [instance-id <id>] Appoint interface to implement required cost of OSPFv3 protocol. The no IPv6 ospf cost [instance-id <id>] restores the default setting 3）Configure OSPFv3 packet sending timer parameter (timer of broadcast interface sending HELLO packet to poll, timer of neighboring layer3 switch invalid timeout, timer of LSA transmission delay and timer of LSA retransmission. Commands Explanation Interface Configuration

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 169 distinguish that whether the DHCP client is from the network connected to Switch1 or Switch2. So, all the PC terminals connected to Switch1 and Switch2 will get addresses from the public address pool of the DHCP server. After the DHCP option 82 function is enabled, since the Switch3 appends the port information of accessing Switch3 to the request message from the client, the server can tell that whether the client is from the network of Swich1 or Swich2, and thus can allocate separate address spaces for the two networks, to simplify the management of networks. The following is the configuration of Swi

• Amer.com SS3GR50i, Admin mode to prevent unauthorized access and malicious modification to the switch. 1.2.2.3 Global Mode Type the config command under Admin Mode will enter the Global Mode prompt “Switch(config)#”. Use the exit command under other configuration modes such as Interface Mode, VLAN mode will return to Global Mode. The user can perform global configuration settings under Global Mode, such as MAC Table, Port Mirroring, VLAN creation, IGMP Snooping start, GVRP and STP, etc. And the user can go further to Interface Mode for configuration o

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 103 Bridge Name SwitchA SwitchB SwitchC SwitchD Bridge MAC Address …00-00-01 …00-00-02 …00-00-03 …00-00-04 Bridge Priority 32768 32768 32768 32768 Port 1 128 128 128 Port 2 128 128 128 Port 3 128 128 Port 4 128 128 Port 5 128 128 Port 6 128 128 Port Priority Port 7 128 128 Port 1 200000 200000 200000 Port 2 200000 200000 200000 Port 3 200000 200000 Port 4 200000 200000 Port 5 200000 200000 Port 6 200000 200000 Route Cost Port 7 200000 200000 By default, the MSTP establishes a tree topology (in blue lines) r

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 256 The configurations of SwitchA: SwitchA(config)#router bgp 100 SwitchA(config-router-bgp)#neighbor 2.2.2.1 remote-as 300 SwitchA(config-router-bgp)#neighbor 3.3.3.2 remote-as 300 SwitchA(config-router-bgp)#neighbor 4.4.4.3 remote-as 400 The configurations of SwitchC: SwitchC(config)#router bgp 300 SwitchC (config-router-bgp)#neighbor 2.2.2.2 remote-as 100 SwitchC (config-router-bgp)#neighbor 2.2.2.2 route-map set-metric out SwitchC (config-router-bgp)#neighbor 1.1.1.2 remote-as 300 SwitchC (config-router-bgp)#exit SwitchC (config)#route-map set-metric permit 10 SwitchC (

• CONFIGURATION GUIDE SS3GR50i/26i 197 ip rip receive version {1 | 2 | } no ip rip receive version Sets the version of RIP packets to receive on all ports; the no action of this command set the version to the one configured by the version command ip rip receive-packet no ip rip receive-packet Enables receiving RIP packets on the interface; the no ip rip receive-packet command

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 220 SwitchC(config-router)#exit Configure MD5 key authentication. SwitchC(config)#interface vlan 1 SwitchC (config-If-Vlan1)#ip ospf authentication message-digest SwitchC (config-If-Vlan1)#ip ospf authentication-key DCS SwitchC (config-If-Vlan1)#exit SwitchC(config)#exit SwitchC# 4)SwitchD： Configure IP address for interface vlan2 SwitchD#config SwitchD(config)# interface vlan 2 SwitchD(config-If-Vlan2)# ip address 10.1.1.4 255.255.255.0 SwitchD(config-If-Vlan2)#exit Enable OSPF protocol, configure the area number for interface vlan2. SwitchD(config)#router ospf SwitchD(config-router)#network 10.1.1.0/24 area 1 SwitchD(

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 163 responsible for DHCP packet forwarding has DHCP relay function. If DHCP relay is not available for the intermediate router, it is recommended to replace the router or upgrade its software to one that has a DHCP relay function. z In such case, DHCP server should be examined for an address pool that is in the same segment of the switch VLAN, such a pool should be added if not present, and (This does not indicate SS3GR50I/SS3GR26I series switch cannot assign IP address for different segments, see

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 42 support program, usually refer to as IMAGE upgrade file. In SS3GR50I/26I series switch, the system image file is allowed to save in FLASH only. SS3GR50I/26I series switch mandates the name of system image file to be uploaded via FTP in Global Mode to be nos.img, other IMAGE system files will be rejected. Boot file: refers to the file initializes the switch, also referred to as the ROM upgrade file (Large size file can be compressed as IMAGE file). In SS3GR50I/26I series switch, the boot file is allowed to save in ROM only. SS3GR50I/26I series switch mandates the name of the boot file to be boot.

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 257 two switches. If the metric comparison between different AS is needed, the command” bgp always-compare-med” will be used. If this command is configured, the routes passed SwitchB are the best to SwitchA. At this time, the following command may be added on SwitchA: “SwitchA (config-router-bgp)# bgp always-compare-med” 29.3.7 Examples of BGP VPN For the configuration of MPLS VPN, BGP is part of the core routing system and it is also an important utility to support ILM and FTN entries on the edge devices. For DCNOS, the BGP protocol together with the LDP protocol, constructs the fo

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 243 be used. Command Explanation BGP configuration mode bgp client-to-client reflection no bgp client-to-client reflection Configure the allowance of the route reflector from clients to clients; the no bgp client-to-client reflection commands forbids this allowance. 6．Configure Peer Groups （1） Create peer groups Command Explanation BGP configuration mode neighbor <TAG> peer-group no neighbor <TAG> peer-group Create peer groups; the no neighbor <TAG> peer-group command deletes peer groups. （2） Add neighbors to peers groups

• 2.4.5 Typical SNMP Configuration Examples Fig 2-2 Typical SNMP Configuration The IP address of the NMS is 1.1.1.5; the IP address of the switch (Agent) is 1.1.1.9 Scenario 1: The NMS network administrative software uses SNMP protocol to obtain data from the switch. The configuration on the switch is listed below: Switch(config)#snmp-server Switch(

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 249 bgp always-compare-med no bgp always-compare-med bgp bestpath as-path ignore no bgp bestpath as-path ignore bgp bestpath compare-confed-aspath no bgp bestpath compare-confed-aspath bgp bestpath compare-routerid no bgp bestpath compare-routerid bgp bestpath med {[confed] [missing-is-worst]} no bgp bestpath med {[confed] [missing-is-worst]} BGP may change some path-select rules by configuration to change the best selection and compare MED under EBGP environment through these command, ignore the AS-PATH length, compare the confederation as-path length, compare the route identifier and compare the confederation MED etc. Its for

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 239 Command Explanation BGP configuration mode neighbor { <ip-address> | <TAG> } soft-reconfiguration inbound no neighbor { <ip-address> | <TAG> } soft-reconfiguration inbound This command can store routing information from neighbors and peers; the no neighbor { <ip-address> | <TAG> } soft-reconfiguration inbound command cancels the storage of routing information. Admin Mode Clear ip bgp {<*>|<as-id>| ex

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 94 Spanning Tree calculation finishes, and the port will learn the MAC address. ) If not the problems mentioned above , please check for the switch portand contact technical support for solution. 10.5 MAC Address Function Extension 10.5.1 MAC Address Binding 10.5.1.1 Introduction to MAC Address Binding Most switches support MAC address learning, each port can dynamically learn several MAC addresses, so that forwarding data streams between known MAC addresses within the ports can be achieved. If a MAC address is aged, the packet destined for that entry will be broadcasted. In other words, a MAC address learned

• Amer.com SS3GR50i, CONFIGURATION GUIDE SS3GR50i/26i 89 Chapter 10 MAC Table Configuration 10.1 Introduction to MAC Table MAC table is a table identifies the mapping relationship between destination MAC addresses and switch ports. MAC addresses can be categorized as static MAC addresses and dynamic MAC addresses. Static MAC addresses are manually configured by the user, have the highest priority and are permanently effective (will not be overwritten by dynamic MAC addresses); dynamic MAC addresses are entries learn

• CONFIGURATION GUIDE SS3GR50i/26i 145 16.3 ARP Scanning Prevention Typical Examples SWITCH B SWITCH A Server (192.168.1.100) PC PC E1/1 E1/19 E1/2 Fig 2-1 ARP scanning prevention typical configuration example In the network topology above, port E1/1 of SWITCH B is connected to port E1/19 of SWITCH A, the port E1/2 of SWITCH A is connected to file server (IP address is 192.168.1.100), and a

• CONFIGURATION GUIDE SS3GR50i/26i 60 normal. The uplink port can communicate with any port normally. The configuration of S1: Switch(config)#isolate-port group test Switch(config)#isolate-port group test switchport interface ethernet 1/1;1/10

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