Version 6.6 221 October 2014
Installation & Operation Manual 26. Connecting the Media Gateway to the IP Network
26.7.3 External Layer 3 Ethernet Switches or Routers
At least two external fully-redundant Layer 3 ethernet switches or routers are required
for connecting the Mediant 8000 to the IP network.
Note: When multiple physically-separated subnets are used, it is possible to either
use the same properly-configured external Layer 3 switch for multiple subnets or
use separate Layer 3 switches for each subnet.
Uplinks of the two available Ethernet Switch (ES) boards (located in slots 9 and 19)
must be connected to a corresponding external Layer 3 Switch or Router as shown in
the figure below. Ensure that you connect all relevant uplinks on both ES boards, as
described in 'Ethernet ports allocation on ES boards' on page 217.
Figure 26-3: Ethernet Port Allocation
External Layer 3 switches or routers must be configured with the same IP addresses.
They must be interconnected at Layer 2 and support non-disruptive failover of IP
traffic in case of the failure of one of them. HSRP (Hot Standby Router Protocol – as
per RFC 2281) or VRRP (Virtual Router Redundancy Protocol – as per RFC 3768)
should be configured on the external Layer 3 Switch or Router for this purpose.
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